Here's the problem:

a. ON what interval(s) is the function concave up?

b. ON what interval(s) is the function concave down?

c. FIND all points of inflection (if any).

So, the first thing I would do is to find the first derivative by doing the whole quotient-rule thing, which gives me:

The next thing I [think I] have to do is to take the derivative of that (second derivative). After doing the quotient rule of that, I get:

I'm sort of lost as to what I need to do next. I've been on spring break for a week and have forgotten a lot of this stuff... Looking back at previous problems just seem to confuse me.