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WAEC Mathematics 2010 Question 48

Question 48

Quadratic Equations

If x2 + kx + 16/9 is a perfect square, find the value of x.

  1. A.8/3
  2. B.7/3
  3. C.5/3
  4. D.2/3
Show the answer and explanation

Answer: A (8/3)

Explanation

x2 + kx + 16/9 = (x + 4/3)2 when k = 2 × 4/3 = 8/3. (The question means the value of k.)