Step-by-step explanation:
The first thing to do is get a graph of the function if you can.
The graph helps you see the following.
The critical points are at +/- 3The graph is increasing from -∞ ≤x<-3 Watch that you do not include - 3The graph is increasing form -3<x<0The graph is decreasing from 0<x<3The graph is decreasing from 3<x<∞