Question

f(x)=(3x-1)^3
знайты: f'(4)

Answer 1

$f(x) = (3x-1)^3\ f'(x)=3(3x-1)^2cdot(3x-1)'=3(3x-1)^2cdot3=9(3x-1)^2\ f'(4) = 9cdot(3cdot4-1)^2=9cdot11^2=9cdot121=1089$