Question

How do you evaluate `f(x)=-x^3+8x^2+3` for `f(-7)`?

Answer 1

`f(-7)=738`

Explanation:

To evaluate f(-7), substitute x = - 7 into f(x).

`rArrf(color(red)(-7))=-(color(red)(-7))^3+8(color(red)(-7))^2+3`

`=-(-343)+8(49)+3`

`=343+392+3`

`=738`