Answer
Increasing: (-2, 0) and (2, ∞)
Decreasing: (-∞, -2) and (0, 2)
Work Step by Step
$f(x) = |x^4 - 16|$
From the graph attached below, the function is increasing from (-2, 0) and (2, ∞)
(These values are determined by eye, at -2 and 2, the function goes from decreasing to increasing instantaneously, whereas at 0, the function increases then decreases
It is decreasing between (-∞, -2) and (0, 2)
