passwella.
Menu

WAEC Mathematics 2019 Question 13

Question 13

Quadratic Equations

Solve 4x2 − 16x + 15 = 0.

  1. A.x = 1½ or x = −2½
  2. B.x = 1½ or x = 2½
  3. C.x = 1½ or x = −1½
  4. D.x = −1½ or x = −2½
Show the answer and explanation

Answer: B (x = 1½ or x = 2½)

Explanation

4x2 − 16x + 15 = (2x − 3)(2x − 5) = 0, so x = 3/2 = 1½ or x = 5/2 = 2½.