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WAEC Mathematics 1988 Question 25

Question 25

Quadratic Equations

Find the roots of the equation 2x2 − 3x − 2 = 0

  1. A.x = −2 or ½
  2. B.x = −2 or 1
  3. C.x = −2 or 2
  4. D.x = −1 or 2
  5. E.x = −½ or 2.
Show the answer and explanation

Answer: E (x = −½ or 2.)

Explanation

2x2 − 3x − 2 = (2x + 1)(x − 2) = 0, so x = −½ or x = 2.