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WAEC Mathematics 2011 Question 16

Question 16

Quadratic Equations

Form the equation whose roots are x = ½ and −⅔.

  1. A.6x2 − x + 2 = 0
  2. B.6x2 − x − 2 = 0
  3. C.6x2 + x + 2 = 0
  4. D.6x2 + x − 2 = 0
Show the answer and explanation

Answer: D (6x2 + x − 2 = 0)

Explanation

(2x − 1)(3x + 2) = 0 gives 6x2 + x − 2 = 0.