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JAMB Mathematics 1980 Question 31

Question 31

Quadratic Equations

What will be the value of k so that the quadratic equation kx2 − 4x + 1 = 0 has two equal roots?

  1. A.2
  2. B.3
  3. C.4
  4. D.8
  5. E.¼
Show the answer and explanation

Answer: C (4)

Explanation

Equal roots need b² = 4ac: 16 = 4k, so k = 4.