** 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) Determine the intervals on which

b) Based on your answer to part (a), determine
the inflection points of ** ordered pair **
(that is, in the form

c) Find the critical numbers of

Relative maxima at:

Relative minima at:

You can earn partial credit on this problem.