Question

If f(x) = 3x 2 + 5x, find f(-2).

Answer 1

`2`

Explanation:

`f(x) = 3x^2 + 5x`

`f(-2) = 3(-2)^2 + 5(-2)`

`f(-2) = 3(4) + 5(-2)`

`f(-2) = 12 + -10`

`f(-2) = 2`

Answer 2

f(- 2) = 2

Explanation:

To evaluate f(- 2), substitute x = - 2 into f(x)

f(- 2) = 3(- 2)² + 5(- 2) = (3 × 4) - 10 = 12 - 10 = 2