Question

Evaluate the function: f(x)=x2+2x, find f(−1)

Answer 1

`f( - 1) = - 1`

Explanation:

`f(x) = {x}^(2) + 2x`

Substitute x = -1 in the equation.

`f( - 1) = {( - 1)}^(2) + 2( - 1) \\ f( - 1) = 1 - 2 \\ f( - 1) = - 1`