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JAMB Mathematics 1991 Question 22

Question 22

Quadratic Equations

Find the positive number n, such that thrice its square is equal to twelve times the number.

  1. A.1
  2. B.2
  3. C.3
  4. D.4
Show the answer and explanation

Answer: D (4)

Explanation

3n2 = 12n gives n(n − 4) = 0. The positive answer is n = 4.