Concavity Test
The second derivative test may also be used to determine the concavity of a function as well as a function's points of inflection.
First, all points at which are found. In each of the intervals created, is then evaluated at a single point. For the intervals where the evaluated value of the function is concave down, and for all intervals between critical points where the evaluated value of the function is concave up. The points that separate intervals of opposing concavity are points of inflection.
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