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WAEC Mathematics 2015 Question 9

Question 9

Quadratic Equations

Find the equation whose roots are ¾ and −4.

  1. A.4x2 − 13x + 12 = 0
  2. B.4x2 − 13x − 12 = 0
  3. C.4x2 + 13x − 12 = 0
  4. D.4x2 + 13x + 12 = 0
Show the answer and explanation

Answer: C (4x2 + 13x − 12 = 0)

Explanation

(4x − 3)(x + 4) = 0 expands to 4x² + 13x − 12 = 0.