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WAEC Mathematics 1997 Question 11

Question 11

Quadratic Equations

One of the roots of the equation 6x2 = 5 − 7x is

  1. A.−1/2
  2. B.−1/3
  3. C.1/2
  4. D.1 2/3
  5. E.2 1/2
Show the answer and explanation

Answer: C (1/2)

Explanation

6x2 + 7x − 5 = 0 factorises as (2x − 1)(3x + 5) = 0, so x = 1/2 or x = −5/3.