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WAEC Mathematics 2000 Question 35

Question 35

Quadratic Equations

Find the equation whose roots are −8 and 5.

  1. A.x2 + 13x + 40 = 0
  2. B.x2 − 13x − 40 = 0
  3. C.x2 − 3x + 40 = 0
  4. D.x2 + 3x − 40 = 0.
Show the answer and explanation

Answer: D (x2 + 3x − 40 = 0.)

Explanation

(x + 8)(x − 5) = x2 + 3x − 40 = 0.