Question

If f(x) = 3x2 – 12x + 4, find f(–2).

Answer 1

40

Explanation:

Put -2 where x is and do the arithmetic.

f(-2) = 3(-2)^2 -12(-2) +4

= 3·4 +24 +4

= 12 + 28 = 40

f(-2) = 40