Question

What is `f(-4)` when `f(x)=-x^2-2x`?

Answer 1

You must replace `x` by `-4` into `f(x)`

Explanation:

if `f(x)=-x^2-2x` for any value of `x`, then `f(-4)=-(-4)^2-2*(-4)=-(16)-(-8)=-16+8=-8`