Math
posted by David .
Find the value(s) of x, so that f’(x) = 0 for the function f(x) = 4x3 – 6x2 – 24x.

I will assume you meant
f(x) = 4x^3 – 6x^2 – 24x
then
f'(x) = 12x^212x  24
= 0
divide by 12
x^2  x  2 = 0
(x2)(x+1) = 0
x = 2 or x = 1