The interval in which the function $f(x) = x^3 - 6x^2 + 9x + 10$ is increasing.

Question

$(-\infty, 1) \cup (3, \infty)$

$(-\infty, -1) \cup (-3, \infty)$

$[1, 3]$

$(-\infty, -1) \cup [3, \infty)$

Please login to view the detailed solution steps...