First Derivative Test Increasing Decreasing Functions (Calculus 1)

This Calculus 1 video explains how to use the first derivative test to determine over what intervals a function is increasing and decreasing. We show you what the sign (positive or negative) of the derivative of a function tells us about whether the graph of a function is increasing or decreasing on an interval. We then introduce and explain the first derivative test and how to use it to find the increasing and decreasing intervals of a function.
0:00 Increasing and decreasing functions (Intro)
1:58 Example (Increasing and decreasing intervals)
7:05 What the first derivative test says
8:25 Example Continued (First derivative test)