How do i very that f ' (x) = g ' (x)?

Question

I did the quotient rule for both and obviously it didnt work... >.< please help

Answer 1

You really didn't give us enough detail.

Two obvious general ideas that may or may not apply in your case:

1. Prove that each of them is greater than or equal to the other.
2. Prove that (f-g)' = 0