Hey /sci/ I'm doing homework for mathematical economics and my calc knowledge escapes me

I have to find the derivative of U=((80-4F)^0.8)(F^0.2)

I remember the product rule such that the answer is the derivative of the first expression times the second plus the first expression times the derivative of the second (or f'*g + f*g') but I can't remember how to solve for the derivative of the first expression ((80-4F)^0.8) because it's a binomial raised to a power.

Can someone help me?

>Pic not related, just trying to attract attention