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

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

b) Determine the intervals on which is increasing and decreasing.
is increasing on:
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 (Separate multiple answers by commas.)
Relative minima occur at (Separate multiple answers by commas.)

You can earn partial credit on this problem.