Function concave up and down calculator

If f ′′(x) < 0 f ′ ′ ( x) < 0 for all x ∈ I x ∈ I, then f f is concave down over I I. We conclude that we can determine the concavity of a function f f by looking at the second derivative of f f. In addition, we observe that a function f f can switch concavity (Figure 6).

Question: Compute the intervals of concave up and concave down as well as all points of inflection for the function f(x) = x^4-6x^3+12x^2. Compute the intervals of concave up and concave down as well as all points of inflection for the function f(x) = x^4-6x^3+12x^2. There are 2 steps to solve this one. Who are the experts?Suppose f ( x ) = − 0.5 ⋅ x 4 + 3 x 2 . Use a graphing calculator (like Desmos) to graph the function f . Determine the interval(s) of the domain over which f has positive concavity (or the graph is "concave up"). (-1,1) Correct Determine the interval(s) of the domain over which f has negative concavity (or the graph is "concave down").42. A function f: R → R is convex (or "concave up") provided that for all x, y ∈ R and t ∈ [0, 1] , f(tx + (1 − t)y) ≤ tf(x) + (1 − t)f(y). Equivalently, a line segment between two points on the graph lies above the graph, the region above the graph is convex, etc. I want to know why the word "convex" goes with the inequality in ...Apr 12, 2022 · Study the graphs below to visualize examples of concave up vs concave down intervals. It’s important to keep in mind that concavity is separate from the notion of increasing/decreasing/constant intervals. A concave up interval can contain both increasing and/or decreasing intervals. A concave downward interval can contain both increasing and ... Free Functions Concavity Calculator - find function concavity intervlas step-by-step To determine concavity, analyze the sign of f''(x). f(x) = xe^-x f'(x) = (1)e^-x + x[e^-x(-1)] = e^-x-xe^-x = -e^-x(x-1) So, f''(x) = [-e^-x(-1)] (x-1)+ (-e^-x)(1) = e^-x (x-1)-e^-x = e^-x(x-2) Now, f''(x) = e^-x(x-2) is continuous on its domain, (-oo, oo), so the only way it can change sign is by passing through zero. (The only partition numbers are the zeros of f''(x)) f''(x) = 0 if and only ... A function is graphed. The x-axis is unnumbered. The graph is a curve. The curve starts on the positive y-axis, moves upward concave up and ends in quadrant 1. An area between the curve and the axes in quadrant 1 is shaded. The shaded area is divided into 4 rectangles of equal width that touch the curve at the top left corners.

Details. To visualize the idea of concavity using the first derivative, consider the tangent line at a point. Recall that the slope of the tangent line is precisely the derivative. As you move along an interval, if the slope of the line is increasing, then is increasing and so the function is concave up. Similarly, if the slope of the line is ...Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more. ... Log InorSign Up. Choose your function, f(x). 1. f x = sin x. 2. Slide a left and right to see the quadratic of best fit at f(a). 3. a, f a. 4. a, 0. 5 ...function-shift-calculator. en. Related Symbolab blog posts. Functions. A function basically relates an input to an output, there's an input, a relationship and an output. For every input... Enter a problem. Cooking Calculators. Cooking Measurement Converter Cooking Ingredient Converter Cake Pan Converter More calculators.For the following function determine: a. intervals where f f f is increasing or decreasing b. local minima and maxima of f f f c. intervals where f f f is concave up and concave down, and d. the inflection points of f f f. f (x) = x 4 − 6 x 3 f(x)=x^{4}-6 x^{3} f (x) = x 4 − 6 x 3And the inflection point is where it goes from concave upward to concave downward (or vice versa). Example: y = 5x 3 + 2x 2 − 3x. Let's work out the second derivative: The derivative is y' = 15x2 + 4x − 3. The second derivative is y'' = 30x + 4. And 30x + 4 is negative up to x = −4/30 = −2/15, positive from there onwards.If f ′′(x) < 0 f ′ ′ ( x) < 0 for all x ∈ I x ∈ I, then f f is concave down over I I. We conclude that we can determine the concavity of a function f f by looking at the second derivative of f f. In addition, we observe that a function f f can switch concavity (Figure 6).

Once you've entered the function and, if necessary, the interval, click the "Calculate" button. The calculator will process the input and generate the output. Result. The calculator will instantly display critical points, extrema (minimum and maximum points), and any additional relevant information based on your input.Second Derivative and Concavity. Graphically, a function is concave up if its graph is curved with the opening upward (Figure \(\PageIndex{1a}\)). Similarly, a function is concave down if its graph opens downward …Since this is positive, the function is increasing on . Increasing on since . Increasing on since . Step 6. Substitute a value from the interval into the derivative to determine if the function is increasing or decreasing. Tap for more steps... Step 6.1. Replace the variable with in the expression. Step 6.2.The interval on the left of the inflection point is ???. On this interval f is (concave up or down) The interval on the right of the inflection point is ???. On this interval, f is (concave up or down.) I'm struggling calculating the second derivative and isolating for x to find the inflection points, can someone walk me through this problem ...This inflection point calculator instantly finds the inflection points of a function and shows the full solution steps so you can easily check your work. ... In other words, the point where the curve (function) changes from concave down to concave up, or concave up to concave down is considered an inflection point. ... This is an inflection ...

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9th Edition • ISBN: 9781337613927 Daniel K. Clegg, James Stewart, Saleem Watson. 11,050 solutions. Find step-by-step Calculus solutions and your answer to the following textbook question: Determine the intervals where the graph of the given function is concave up and concave down, and identify inflection points. f (x)=sin x-cos x.Free Pre-Algebra, Algebra, Trigonometry, Calculus, Geometry, Statistics and Chemistry calculators step-by-stepThe function f(x) = ln(3x²+7) is concave up on the interval (-∞,0) and concave down on the interval (0,∞), with an inflection point at x=0. Explanation: To determine the intervals on which the function f(x) = ln(3x²+7) is concave up or concave down and to identify any inflection points, we need to find its second derivative.If f ′′(x) < 0 f ′ ′ ( x) < 0 for all x ∈ I x ∈ I, then f f is concave down over I I. We conclude that we can determine the concavity of a function f f by looking at the second derivative of f f. In addition, we observe that a function f f can switch concavity (Figure 6).1. taking the second derivative I got x = 16 3 x = 16 3 as the critical point. I assume that you mean that you set f′′(x) = 0 f ″ ( x) = 0 and found a solution of x = 16 3 x = 16 3. This is not a critical point. Rather it is an inflection point. In other words, this is where the function changes from concave up to concave down (or vice ...After solving answers ar …. Determine the intervals on which the following function is concave up or concave down. Identify any inflection points f (x)=3x² - 2x² +1 WANA Determine the intervals on which the given function is concave up or concave down. Select the correct choice below and fill in the answer box (es) to c your choice.

Jun 15, 2014 at 13:40. 2. It depends on your definition of concave: there are the notion of "concave" and "strictly concave". In x ≥ 0 x ≥ 0 arctan(x) arctan. ⁡. ( x) is concave, but not strictly concave. (The difference between the two notions translate in terms of the second derivative as the two conditions f′′ ≤ 0 f ″ ≤ 0 or ...3. If the second derivative f'' is positive (+) , then the function f is concave up () . 4. If the second derivative f'' is negative (-) , then the function f is concave down () . 5. The point x=a determines a relative maximum for function f if f is continuous at x=a, and the first derivative f' is positive (+) for x<a and negative (-) for x>a.Question: Given f (x) = (x - 2)^2 (x - 4)^2, determine a. interval where f (x) is increasing or decreasing, b local minima and maxima of f (x) c intervals where f (x) is concave up and concave down, and d. the inflection points of f (x), Sketch the curve, and then use a calculator to compare your answer. If you cannot determine the exact answer ...To determine concavity, analyze the sign of f''(x). f(x) = xe^-x f'(x) = (1)e^-x + x[e^-x(-1)] = e^-x-xe^-x = -e^-x(x-1) So, f''(x) = [-e^-x(-1)] (x-1)+ (-e^-x)(1) = e^-x (x-1)-e^-x = e^-x(x-2) Now, f''(x) = e^-x(x-2) is continuous on its domain, (-oo, oo), so the only way it can change sign is by passing through zero. (The only partition numbers are the zeros of …The intervals where a function is concave up or down is found by taking second derivative of the function. Use the power rule which states: Now, set equal to to find the point(s) of infleciton. In this case, . To find the concave up region, find where is positive. This will either be to the left of or to the right of . To find out which, plug ...Math. Calculus. Calculus questions and answers. determine where each function is increasing, decreasing, concave up, and concave down. With the help of a graphing calculator, sketch the graph of each function and label the intervals where it is increasing, decreasing, concave up, and concave down. A) y = x^2+ 5x, x ?The function is concave up on and concave down on (Type your answers in interval notation. Use a comma to separate answers as needed) B. The function is concave up on (− ∞, ∞) C. The function is concave down on (− ∞, ∞) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A.Study the graphs below to visualize examples of concave up vs concave down intervals. It’s important to keep in mind that concavity is separate from the notion of increasing/decreasing/constant intervals. A concave up interval can contain both increasing and/or decreasing intervals. A concave downward interval can contain both increasing and ...Given the function f(x) = x(x-4)^3 , find the intervals where the function is concave up or down. For the function f(x) = 12x^5 + 45x^4 - 360x^3 + 4 , find the intervals where the function is concave up or down. Determine the intervals on which the following function is concave up and concave down. F (x) = 8 x^3 + 16 x^2 + 8 x.Concavity Calculator: Calculate the Concavity of a Function. Concavity is an important concept in calculus that describes the curvature of a function. A function is said to be concave up if it curves upward, and concave down if it curves downward. The concavity of a function can be determined by calculating its second derivative.This is where the Concavity Calculator comes in handy.Calculate the second derivative of f. Find where f is concave up, concave down, and has inflection points. f(x)= (3x^2) / (x^2 + 49)? * I figured out the second derivative. f"(x) = -(294 (3x^2 - 49)) / (x^2 +49)^3 ... To determine the concavity of a function, you need to know the sign of the 2nd derivative over the particular intervals between ...

The graph of a function f is concave up when f ′ is increasing. That means as one looks at a concave up graph from left to right, the slopes of the tangent lines will be increasing. Consider Figure 3.4.1 (a), where a concave up graph is shown along with some tangent lines. Notice how the tangent line on the left is steep, downward, corresponding to a small value of f ′.

A function (in black) is convex if and only if the region above its graph (in green) is a convex set. A graph of the bivariate convex function x 2 + xy + y 2. Convex vs. Not convex. In mathematics, a real-valued function is called convex if the line segment between any two distinct points on the graph of the function lies above the graph between the two points. . Equivalently, a function is ...Calculate Inflection Point: Computing... Get this widget. Build your own widget ...Graphically, a function is concave up if its graph is curved with the opening upward (Figure 1a). Similarly, a function is concave down if its graph opens downward (Figure 1b). Figure 1. This figure shows the concavity of a function at several points. Notice that a function can be concave up regardless of whether it is increasing or decreasing.Excel is a powerful tool that offers a wide range of functions and formulas to help users perform complex calculations, analyze data, and automate tasks. However, with so many opti...Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more.We say this function f f is concave up. Figure 4.34(b) shows a function f f that curves downward. As x x increases, the slope of the tangent line decreases. Since the derivative decreases as x x increases, f ′ f ′ is a decreasing function. We say this function f f is concave down.Free Function Transformation Calculator - describe function transformation to the parent function step-by-stepThe Derivative Calculator lets you calculate derivatives of functions online — for free! Our calculator allows you to check your solutions to calculus exercises. It helps you practice by showing you the full working (step by step differentiation). The Derivative Calculator supports computing first, second, …, fifth derivatives as well as ...If you use the left edge of each subdivision to approximate, you're going to have an overestimate. Because the left edge, the value of the function there, is going to be higher than the value of the function at any of the point in the subdivision. That's why for decreasing function, the left Riemann sum is going to be an overestimation.

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of a function can tell you whether the linear approximation will be an overestimate or an underestimate. 1.If f(x) is concave up in some interval around x= c, then L(x) underestimates in this interval. 2.If f(x) is concave down in some interval around x= c, then L(x) overestimates in this interval.Here's the best way to solve it. Please gi …. Suppose f (x) is an decreasing, concave up function and you use numeric integration to compute the integral of f over the interval (0,1). Put the values of the approximations using n = 70 for the left end-point rule (Le), right end-point rule (Rzo), and Simpson's rule (Sro) from the least to the ...calculus-function-extreme-points-calculator. en. Related Symbolab blog posts. Functions. A function basically relates an input to an output, there’s an input, a relationship and an output. For every input... Enter a problem. Cooking Calculators.Knowing how much water to drink daily can help your body function like the well-lubricated engine it is. But knowing how much water to drink a day, in general, is just the start. W...Graphically, a function is concave up if its graph is curved with the opening upward (Figure 1a). Similarly, a function is concave down if its graph opens downward (Figure 1b). Figure 1. This figure shows the concavity of a function at several points. Notice that a function can be concave up regardless of whether it is increasing or decreasing.Determine where the graph of the function is concave up and concave down. (If you need to enter ∞o or -00, type INFINITY or -INFINITY.) f (x) = x³ + 9x² + 6x - 6 ) (concave down) ) (concave up) There are 2 steps to solve this one.Question: To determine the intervals where a function is concave up and concave down, the first step is to find all the x values where (select all that are needed): f' (x) = 0 f (x) = 0 f' (2) is undefined f'' (x) = 0 of'' (x) is undefined f (x) is undefined. There are 2 steps to solve this one.There are two basic ways of calculating variance in Excel using the function VAR or VAR.S. VAR and VAR.S functions can be used to calculate variance for a sample of values. VAR is ...Function f is graphed. The x-axis goes from negative 4 to 4. The graph consists of a curve. The curve starts in quadrant 3, moves upward with decreasing steepness to about (negative 1.3, 1), moves downward with increasing steepness to about (negative 1, 0.7), continues downward with decreasing steepness to the origin, moves upward with increasing steepness, and ends in quadrant 1.1. Suppose you pour water into a cylinder of such cross section, ConcaveUp trickles water down the trough and holds water in the tub. ConcaveDown trickles water away and spills out, water falling down. In the first case slope is <0 to start with, increases to 0 and next becomes > 0. In the second case slope is >0 at start, decreases to 0 and ...Expert-verified. Determine the intervals on which the following function is concave up or concave down. Identify any inflection points. f (x) = 3x -2° +5 Determine the intervals on which the given function is concave up or concave down. Select the correct choice below and fill in the answer box (es) to complete your choice. (Simplify your answer. ….

Anyway here is how to find concavity without calculus. Step 1: Given f (x), find f (a), f (b), f (c), for x= a, b and c, where a < c < b. Where a and b are the points of interest. C is just any convenient point in between them. Step 2: Find the equation of the line that connects the points found for a and b.You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: f (x) = 5 sin (x) + 5 cos (x), 0 ≤ x ≤ 2π (a) Find the interval on which f is increasing. (Enter your answer using interval notation.) Find the interval on which f is decreasing. (Enter your answer using interval notation.)The intervals of increasing are x in (-oo,-2)uu(3,+oo) and the interval of decreasing is x in (-2,3). Please see below for the concavities. The function is f(x)=2x^3-3x^2-36x-7 To fd the interval of increasing and decreasing, calculate the first derivative f'(x)=6x^2-6x-36 To find the critical points, let f'(x)=0 6x^2-6x-36=0 =>, x^2-x-6=0 =>, (x-3)(x+2)=0 The critical points are {(x=3),(x=-2 ...Find step-by-step Biology solutions and your answer to the following textbook question: Determine where each function is increasing, decreasing, concave up, and concave down. With the help of a graphing calculator, sketch the graph of each function and label the intervals where it is increasing, decreasing, concave up, and concave down. Make sure that your graphs and your calculations agree ...Intervals Where Function is Concave Up and Concave Down Polynomial ExampleIf you enjoyed this video please consider liking, sharing, and subscribing.Udemy Co...Here's the best way to solve it. Sketch the graph of the following function. Indicate where the function is increasing or decreasing where any relative extrema occur, where asymptotes occur, where the graph is concave up or concave down, where any points of inflection occur, and where any intercepts occur. X2-8 f (x)=*-3 O A. Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more. Concavity | Desmos We say this function f f is concave up. Figure 4.34(b) shows a function f f that curves downward. As x x increases, the slope of the tangent line decreases. Since the derivative decreases as x x increases, f ′ f ′ is a decreasing function. We say this function f f is concave down. Function concave up and down calculator, open intervals where the function is concave up and concave down. 1) y = x3 − 3x2 + 4 x y −8 −6 −4 −2 2 4 6 8 −8 −6 −4 −2 2 4 6 8 Inflection point at: x = 1 No discontinuities exist., When the second derivative is negative, the function is concave downward. And the inflection point is where it goes from concave upward to concave downward (or vice versa). Example: y = 5x 3 + 2x 2 − 3x. Let's work out the second derivative: The derivative is y' = 15x2 + 4x − 3. The second derivative is y'' = 30x + 4., The concavity of a function/graph is an important property pertaining to the second derivative of the function. In particular: If 0">f′′(x)>0, the graph is concave up (or convex) at that value of x.. If f′′(x)<0, the graph is concave down (or just concave) at that value of x.. If f′′(x)=0 and the concavity of the graph changes (from up to down or vice versa), then the graph is at ..., Nov 17, 2015 ... The function is concave down ... Sign up. Find A Tutor. Search For Tutors ... To answer this question use a graphing calculator to graph the ..., Here's the best way to solve it. Examine the curvature of the graph by observing the direction in which the graph bends. for any doubt p …. Estimate the intervals where the function shown below is concave up and/or concave down. A. Concave up for x > 0 Concave down for x < 0 B. Concave up for -1 < x < 1 Concave down for x < -1, x> 1 Concave ..., The function is concave up on and concave down on (Type your answers in interval notation. Use a comma to separate answers as needed.) OB. The function is concave up on (-00,00). OC. The function is concave down on (-00,00) 19 접 Select the correct choice below and fill in any answer boxes within your choice. A. The function has an inflection ..., The calculator will try to find the domain, range, x-intercepts, y-intercepts, derivative, integral, asymptotes, intervals of increase and decrease, critical (stationary) points, …, Constructing the graph of an antiderivative. Preview Activity 5.1 demonstrates that when we can find the exact area under a given graph on any given interval, it is possible to construct an accurate graph of the given function's antiderivative: that is, we can find a representation of a function whose derivative is the given one., f(x) is concave on (-oo,-4.5) and (0,oo), and f(x) is convex on (-4.5,0). To find where a function is concave up, find where the second derivative of the function is positive. f(x)=-x^4-9x^3+2x+4 Find f'(x): f'(x)=-4x^3-27x^2+2 Next, find f''(x): f''(x)=-12x^2-54x f''(x)=(-6x)(2x+9) Set f''(x) equal to zero to find inflection points 0=(-6x)(2x+9) x=0, x=-4.5 After checking the signs of values ..., The inflection points of a function are the points where the function changes from either "concave up to concave down" or "concave down to concave up". To find the critical points of a cubic function f(x) = ax 3 + bx 2 + cx + d, we set the second derivative to zero and solve. i.e., f''(x) = 0. 6ax + 2b = 0. 6ax = -2b. x = -b/3a, We have the graph of f(x) and need to determine the intervals where it's concave up and concave down as well as find the inflection points. Enjoy!, 1. taking the second derivative I got x = 16 3 x = 16 3 as the critical point. I assume that you mean that you set f′′(x) = 0 f ″ ( x) = 0 and found a solution of x = 16 3 x = 16 3. This is not a critical point. Rather it is an inflection point. In other words, this is where the function changes from concave up to concave down (or vice ..., Math; Calculus; Calculus questions and answers; The first derivative of the function f is defined by f'(x) = (x2 + 1) sin(3x-1) for -1.5 < x < 1.5. On which of the following intervals is the graph of f concave up?, Learning Objectives. Explain how the sign of the first derivative affects the shape of a function's graph. State the first derivative test for critical points. Use concavity and inflection points to explain how the sign of the second derivative affects the shape of a function's graph. Explain the concavity test for a function over an open ..., ection point at x= 1, and is concave down on (1;1). 4. Sketch the graph of a continuous function, y= f(x), which is decreasing on (1 ;1), has a relative minimum at x= 1, and does not have any in ection points. or 5. Sketch the graph of a continuous function y= f(x) which satis es all of the following conditions: Domain of f(x) is (1 ;1), From figure it follows that on the interval the graph of the function is convex up (or concave down). On the interval - convex down (or concave up). The point is called an …, Function f is graphed. The x-axis is unnumbered. The graph consists of a curve. The curve starts in quadrant 2, moves downward concave up to a minimum point in quadrant 1, moves upward concave up and then concave down to a maximum point in quadrant 1, moves downward concave down and ends in quadrant 4. , I'm looking for a concave down increasing-function, see the image in the right lower corner. Basically I need a function f(x) which will rise slower as x is increasing. The x will be in range of [0.10 .. 10], so f(2x) < 2*f(x) is true. Also if. I would also like to have some constants which can change the way/speed the function is concaving., Study the graphs below to visualize examples of concave up vs concave down intervals. It’s important to keep in mind that concavity is separate from the notion of increasing/decreasing/constant intervals. A concave up interval can contain both increasing and/or decreasing intervals. A concave downward interval can contain both increasing and ..., Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more., Concave up (also called convex) or concave down are descriptions for a graph, or part of a graph: A concave up graph looks roughly like the letter U. A concave down graph is shaped like an upside down U (“⋒”). They tell us something about the shape of a graph, or more specifically, how it bends. That kind of information is useful when it ..., Since this is positive, the function is increasing on . Increasing on since . Increasing on since . Step 6. Substitute a value from the interval into the derivative to determine if the function is increasing or decreasing. Tap for more steps... Step 6.1. Replace the variable with in the expression. Step 6.2., What x values is the function concave down if #f(x) = 15x^(2/3) + 5x#? ... On what intervals the following equation is concave up, concave down and where it's inflection... See all questions in Analyzing Concavity of a Function Impact of this question. 7581 views around the world ..., Step 1. By the Sum Rule, the derivative of − 4 x 3 − 30 x 2 + 432 x + 1 with respect to x is d d x [ − 4 x 3] + d d x [ − 30 x 2] + d d x [ 432 x] + d d x [ 1]. Determine the open intervals in which the function is concave up or down. Record those intervals below. If there is more than one, be sure to list them separated with commas., Wolfram Language function: Compute the regions on which an expression is concave up or down. Complete documentation and usage examples. ... Note that at stationary points of the expression, the …, Calculus questions and answers. 2. For each of the functions below, use your graphing calculator to draw a graph of the functio and then estimate the r coordinates of its inflection points. List all estimated points of inflection, all intervals where the function is concave up, and all the intervals where the functio is concave down., open intervals where the function is concave up and concave down. 1) y = x3 − 3x2 + 4 x y −8 −6 −4 −2 2 4 6 8 −8 −6 −4 −2 2 4 6 8 Inflection point at: x = 1 No discontinuities exist., The interval on the left of the inflection point is ???. On this interval f is (concave up or down) The interval on the right of the inflection point is ???. On this interval, f is (concave up or down.) I'm struggling calculating the second derivative and isolating for x to find the inflection points, can someone walk me through this problem ..., The inflection points of a function are the points where the function changes from either "concave up to concave down" or "concave down to concave up". To find the critical points of a cubic function f(x) = ax 3 + bx 2 + cx + d, we set the second derivative to zero and solve. i.e., f''(x) = 0. 6ax + 2b = 0. 6ax = -2b. x = -b/3a, Answer: Yes, the graph changes from concave-down to concave-up. 4. Use the trace command to approach x = -1. Look at the y-values on both sides of x = -1. Do the same for x = 2. a. Discuss what happens to the y-values on each side of x = -1. Answer: Students should see that the two function values on both sides of x = -1 are less than the, 1. I have quick question regarding concave up and downn. in the function f(x) = x 4 − x− −−−−√ f ( x) = x 4 − x. the critical point is 83 8 3 as it is the local maximum. taking the second derivative I got x = 16 3 x = 16 3 as the critical point but this is not allowed by the domain so how can I know if I am function concaves up ... , Second Derivative and Concavity. Graphically, a function is concave up if its graph is curved with the opening upward (Figure \(\PageIndex{1a}\)). Similarly, a function is concave down if its graph opens downward (Figure \(\PageIndex{1b}\)).. Figure \(\PageIndex{1}\) This figure shows the concavity of a function at several points., For example, if some random function is concave down when x < 2, is it possible for there to be more than one x value < 0 where f' = 0? Thanks! Answer Button navigates to signup page ... When f''(x) is positive, f(x) is concave up When f''(x) is negative, f(x) is concave down