turunan fungsi f(x) = x^4 - 2x^3 + 7x +13

f(x) = x^(4) - 2x^(3) + 7x + 13
f'(x) = 1.4.x^(4-1) - 2.3.x^(3-1) + 7.1.x^(1-1) + 13.0.x^(0-1)
f'(x) = 4x^(3) - 6x^(2) + 7

f(x) = x^4 - 2x^3 + 7x +13

f'(x) = 4x^3 - 2(3)x^2 + 7
f'(x) = 4x^3 - 6x^2 + 7