Question

If f(x) = 3x2 - x, find f(-2).

10
14
38

Answer 1

'Ello.

Just plug in the values.

f(-2) = 3(-2)^2 - (-2) {Equation}
f(-2) = 3(4) - (-2) {Multiply}
f(-2) = 12 - (-2) {The signs become a positive; add}
f(-2) = 14 {Answer}

You're welcome.

Answer 2

f(x) = 3x^2-x

F(-2)

replace x with -2

3(-2)^2 - -2 =

3*4 +2 = 14

Answer is 14