Khan Academy Static

Critical points are points where a function may obtain their minimum or maximum value. They play a critical role (pun intended) in analyzing the increasing and decreasing intervals of functions, and in finding their minimum and maximum points.

5144_Finding_critical_points.html

5141_Introduction_to_minimum_and_maximum_points.html

5143_Critical_points_introduction.html

5142_Identifying_relative_minimum_and_maximum_values.html