Question

Find f'(4) if f'(x) = 90x^2+72x-3x^0 and f(x) = 30x^3+36x^2-35x-42

Answer 1

just put x=4 in f'(x)

Answer 2

When I did that I got 1725 but it registered it as the incorrect answer. Where am I going wrong on it?

Answer 3

actually,f'(x) = 90x^2+72x-35
now put x=4

Answer 4

its 1693