** NOTE: **
When using interval notation in WeBWorK, remember
that:

You use 'INF' for

And use 'U' for the union symbol.

Enter ** DNE ** if an answer does not exist.

a) Find the critical numbers of

b) Determine the intervals on which

c) Use the First Derivative Test to determine whether each
critical point is a relative maximum, minimum, or neither.

Relative maxima occur at

Relative minima occur at

You can earn partial credit on this problem.