If f(x) = 9x^2 + 5x - 8, then f(-2) = ?

If f(x) = 9x2 + 5x - 8, then f(-2) = ?

  1. -54
  2. -18
  3. 18
  4. 36
  5. 38

Answer

The correct answer is C.

When you substitute -2 for x, you get

9(-2)2 + 5(-2) - 8

= 9(4) + (-10) - 8

= 36 - 10 - 8

= 18