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WAEC Mathematics 2018 Question 34

Question 34

Quadratic Equations

Solve the equation 2x2 − x − 6 = 0.

  1. A.x = −3/2 or 2
  2. B.x = −2 or 3/2
  3. C.x = −3 or 2
  4. D.x = 3 or 2
Show the answer and explanation

Answer: A (x = −3/2 or 2)

Explanation

2x² − x − 6 = (2x + 3)(x − 2) = 0, so x = −3/2 or 2.