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WAEC Mathematics 2009 Question 50

Question 50

Quadratic Equations

Find the quadratic equation whose roots are −1/2 and 3.

  1. A.2x2 − 2x + 3 = 0
  2. B.2x2 − 2x − 3 = 0
  3. C.2x2 − 5x + 3 = 0
  4. D.2x2 − 5x − 3 = 0
Show the answer and explanation

Answer: D (2x2 − 5x − 3 = 0)

Explanation

(2x + 1)(x − 3) = 0 gives 2x2 − 5x − 3 = 0.