OAU Post-UTME Mathematics 2019 Question 6

Question 6

Quadratic Equations

Solve x2 − 16x + 64 = 0

  1. A.8
  2. B.−8
  3. C.8 (twice)
  4. D.−8(twice)
Show the answer and explanation

Answer: C (8 (twice))

Explanation

x² − 16x + 64 = (x − 8)², so x = 8 is a repeated root.