Let f(x)=–5x(x–5).

Question

Then f'(–1)=
And after simplifying f'(x)=

Hint: You may want to expand and simplify the expression for f(x) first.

Answer 1

John, I really believe that anybody who studies Calculus should be able to do an easy question such as this.

f(x) = 5x^2 - 25x

I will let you take it from there