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If 3 is a solution of 3x^2 + (k -1) x + 9 = 0, then k =?
  1. 13
  2. -11
  3. 11
  4. None of these
Explanation

Since 3 is a solution, plug x = 3 into the equation:

3(3)^2 + (k - 1)(3) + 9 = 0

27 + 3k - 3 + 9 = 0

3k + 33 = 0

3k = -33

k = -11

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