Question

Given the function f(x) = 3x2 − 4, what is f(-2)?

A. -40
B. -16
C. 8
D. 32

Answer 1

All this is asking you to do is plug in -2 for x

So

f(x)=3x²-4

f(-2)=3(-2²)-4

f(-2)=12-4

f(-2)=8

Answer 2

^^ correct! It would be 8! Your answer is C.