SAT Math Question of the Day

Math Category: Functions:

Q: If f(a) = 4a2 + 2a + 3, then f(-2) =

  1. -17
  2. -15
  3. 15
  4. 17
  5. 23

UNANSWERED.

The correct answer is C.

A: The answer is 15. To solve this function problem, plug in the number -2 wherever the a occurs
f(a) = 4a2 + 2a + 3
f(-2) = 4(-2)2 + 2(-2) + 3
      = 16 - 4 + 3
      = 15