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WAEC Mathematics 1988 Question 26

Question 26

Quadratic Equations

What value of k makes the given expression a perfect square? m2 − 8m + k

  1. A.2
  2. B.4
  3. C.8
  4. D.16
  5. E.64.
Show the answer and explanation

Answer: D (16)

Explanation

For a perfect square, k = (half the coefficient of m)2 = (−4)2 = 16, giving (m − 4)2.