Question

determine all intervals on which the graph of f is decreasing.

Explanation:

Step1: Identify decreasing - part of graph

A function is decreasing when the graph goes down as we move from left - to - right.

Step2: Determine intervals

By observing the graph, we see that the function $f$ is decreasing on the intervals $(-8,-3)$ and $(2,4)$.

Answer:

$(-8,-3)\cup(2,4)$