Question

If f(x) = 2x3, what is f(-1) and f(1)?

Answer 1

To find f(-1) we need to plug the value x=-1 into the function:

$f(-1)=2(-1)^3=2(-1)=-2$

then f(-1)=-2.

Now, to find f(1) we plug x=1 into the function:

$f(1)=2(1)^3=2(1)=2$

then f(1)=2.