F(x)=(3x-1)(9x^2+3x+1) . Найти f'(1)

Question

F(x)=(3x-1)(9x^2+3x+1) . Найти f'(1)

Answer 1

F(x)=(3x-1)*(9x^2+3x+1) = F(x)=27x^3 + 9x^2 + 3x - 9x^2 - 3x - 1 = 27x^3 - 1
F'(x) = 81x^2
F'(1) = 81 * 1^2 = 81