# Critical numbers

Practice finding critical numbers.

### Problem

Find the local minima and local maxima of the function f by analyzing the graph of the derivative f, space, prime below.
Note: This is the graph of space, f, space, prime, space, not the graph of space, f, space.
The function space, f, space has a local minimum at space, x, equals, space
.
The function space, f, space has a local maximum at space, x, equals, space
.
Get 5 answers correct in a row