Answer
(a)
Increasing on $(-2,0)\cup(2, 4)$,
Decreasing on $(-4, -2) \cup (0,2)$
(b)
Absolute maximum at $(-4,2)$.
Absolute minimum at $(2, -3)$.
local maximum at $(0,1)$ and $(4, -1)$.
local minimum at $(-2,0)$.
Work Step by Step
See image below.
