passwella.
Menu

WAEC Mathematics 2020 Question 15

Question 15

Quadratic Equations

Find the quadratic equation whose whose roots are ½ and −⅓.

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

Answer: D (6x2 − x − 1 = 0)

Explanation

The factors are (2x − 1) and (3x + 1). Their product is 6x2 − x − 1 = 0.