Hey there. I am working on a function problem with which I am having a hard time getting started on.

Differentiate the following function:

f(x) = 3x/x^2 + 4

Once I can get it to polynomial form I'll be good to go, but I'm a little stuck as it stands now. Could somebody give me a nudge to get me started? I think it has something to do with x^-n = 1/x^n.... Thanks.