The problem is:

(x) = ((1/y^2) - (2/y^4)) (y + 8y^3)F

I can find derivatives from other functions, but my professor has neglected to tell us how to do it with functions like this. I have tried this problem many times, with varying answers: It is so frustrating. I have used the product rule right away, or I have multiplied it out first and then used to power rule to find f'(x), but I keep getting the wrong answer. Please explain how to get the right answer and walk me through the question step by step. Thank you so much.