You already have , so you must be looking for something else. If it's the derivative of f(x), remember the power rule: . And the derivative of a sum of terms is the sum of the derivatives of each of the individual terms.
Find f(x) for the given function f and simplify as much as possible
I'm really, really rusty...just started precalculus this fall and I can't remember how to do this (with the ...what is it called again?)
Thank you in advanced!