f(x)=(5x-x^2)^4 .Tentukan : f'(x)

f'(x) = 4 ( 5x - x^2)^3 (5 - 2x)

f(x) = (5x - x²)⁴
y = (5x - x²)⁴
jika
y = (f(x))^n
maka
y' = n . (f(x))^(n-1) . f'(x)

maka
y' = 4 . (5x -x²)³ (5 -2x)
f'(x) = (20-8x)(5x-x²)³