Question

Let f(x) = 2x3 – 4x.
Find f(-2).

Answer 1

Answer:

Step-by-step explanation:

f(x) = 2x^3 - 4x.....find f(-2).....so sub in -2 for x

f(-2) = 2(-2^3) - 4(-2)

f(-2) = 2(-8) + 8

f(-2) = -16 + 8

f(-2) = -8 <==

Answer 2

We have $f(x)=2x^3-4x$, to find $f(-2)$ put -2 instead of x, $f(-2)=2(-2)^3-4(-2)=-16+8=\boxed{-8}$.

Hope this helps.