# What does f'(x) even mean?

**Calculus**Level pending

Sanjoy is given a function f(x) = (1 + 7i - x) (7 + 5i - x) (3 + i - x).The mysterious challenge master of Calculus tests his wit by asking him what f'(x) is. However, Sanjoy does not know what f'(x) even means... try to help the poor lad out by finding the sum of the coefficients of f'(x).