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Review your knowledge of concavity of functions and how we use differential calculus to analyze it.
- You have two functions f and g, where f''>0 and g''>0. If you take the second derivative of f+g, you get f''+g'', which is positive. So their sum i...
- In order for 𝑓(𝑥) to be concave up, in some interval, 𝑓 ''(𝑥) has to be greater than or equal to 0 (i.e. non-negative) for all 𝑥 in that inter...
- In general, no. Points where f"(x)= 0 are specifically called inflection points. But in the example provided, -2 is also a critical point (Observe...
- Product rule: d/dx[f(x)*g(x)] = f'(x)g(x) + f(x)g'(x) f(x) = (x-1)³ and g(x) = x
Dec 21, 2020 · Definition Concave Up and Concave Down. Let \(f\) be differentiable on an interval \(I\). The graph of \(f\) is concave up on \(I\) if \(f'\) is increasing. The graph of \(f\) is concave down on \(I\) if \(f'\) is decreasing. If \(f'\) is constant then the graph of \(f\) is said to have no concavity.
The concavity of the graph of a function refers to the curvature of the graph over an interval; this curvature is described as being concave up or concave down. Generally, a concave up curve has a shape resembling "∪" and a concave down curve has a shape resembling "∩" as shown in the figure below. Concave up.
If f ′ (x) is negative on an interval, the graph of y = f(x) is decreasing on that interval. The second derivative tells us if a function is concave up or concave down. If f ″ (x) is positive on an interval, the graph of y = f(x) is concave up on that interval.
Dec 21, 2020 · If we are trying to understand the shape of the graph of a function, knowing where it is concave up and concave down helps us to get a more accurate picture. Of particular interest are points at which the concavity changes from up to down or down to up; such points are called inflection points.
Nov 21, 2023 · Examples of concavity: Consider the function {eq}f(x)=\frac{1}{8} x^4-3x^2 {/eq}. The first derivative would be {eq}f' (x)=\frac{1}{2} x^3-6x {/eq}.
Nov 14, 2023 · A concave function (sometimes called ''concave down'') is a function for which any secant line (a line connecting two points on the function) lies below the...
