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WAEC Mathematics 2003 Question 43

Question 43

Quadratic Equations

Find the equation whose roots are −2/3 and 3

  1. A.3x2 + 11x − 6 = 0
  2. B.3x2 + 7x + 6 = 0
  3. C.3x2 − 11x − 6 = 0
  4. D.3x2 − 7x − 6 = 0
Show the answer and explanation

Answer: D (3x2 − 7x − 6 = 0)

Explanation

(3x + 2)(x − 3) = 3x2 − 7x − 6 = 0.