NOTE: When using interval notation in WeBWorK, remember that:
You use 'INF' for $\infty$ and '-INF' for $-\infty$.
And use 'U' for the union symbol.
Enter DNE if an answer does not exist.

a) Find the critical numbers of $f$. (Separate multiple answers by commas.)

b) Determine the intervals on which $f$ is increasing and decreasing.
$f$ is increasing on:
$f$ is decreasing on:

c) Use the First Derivative Test to determine whether each critical point is a relative maximum, minimum, or neither.
Relative maxima occur at $x =$ (Separate multiple answers by commas.)
Relative minima occur at $x =$ (Separate multiple answers by commas.)