Whitman College: David Guichard's "Calculus, Chapter 5: Curve Sketching, Section 5.3: The Second Derivative Test"

Read Section 5.3 (pages 108 and 109). In this reading, you will see how to use information about the second derivative (that is, the derivative of the derivative) of a function to find local maxima and minima.

Click https://s3.amazonaws.com/saylordotorg-resources/wwwresources/site/wp-content/uploads/2012/07/calculus_05_Curve_Sketching.pdf link to open resource.