1. The problem statement, all variables and given/known data If d/dx (f(2x^4)) = 8x^5 Calculate f'(x) 2. Relevant equations 3. The attempt at a solution Well , we have been only doing derivatives for 2-3 class and its new for me. From what I understand in this question is. You have a function f(x) = something The derivative of this function when you plug in 2x^4 gives you 8x^5 With that i suppose I should be able to find the equation of f(x) and then give f'(x) but I really don't know how to actually do this.