Find the critical points of and use the second derivative test to classify them as relative maxima or relative minima, where




I'm completely stuck with this question; it is much harder than the ones on the exam. I'd appreciate anyone who can point me in the right direction as to where/how to start.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram