Question 3 (1 point)
If $f(x) = x^{\frac{1}{3}}(x^2 - 56)$, then $f$ is increasing on which one of the following intervals?
a) $(-\infty, -\sqrt{8}) \cup (\sqrt{8}, \infty)$
b) $(-\infty, 0) \cup (\sqrt{8}, \infty)$
c) $(-\sqrt{8}, 0) \cup (0, \sqrt{8})$
d) $(-\sqrt{8}, 0)$
e) $(0, \sqrt{8})$
Question 4 (1 point)