Plz im confused : / in two or more complete sentences, explain how to find the interval(s) in which the function f(x) 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.

Decreaseing means where it is going down
those blank points mean not including
brackets mean inlclude, it's like the ≤ or ≥ sign
parenthasees means not include, it's like the < or > sign

it is going down from -8 to -5, not including -5 so [-8,-5)
also going down from 4 to 8, not including 8, so [4,8)
the union is including both

[-8,-5) U [4,8) is answer for where the function is decreasing