In two or more complete sentences, describe how to find the interval(s) where the function is decreasing and how interval notation is used to express the interval(s). In your final answer, include the interval in which the function is decreasing.

The interval in which the function is decreasing is:
(-5,0]
From the graph we see that the function is increasing in the interval : [0,4]
and is decreasing in the interval : (-5,0]
and is constant in the interval: [-8,-5)∪[4,8)