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

Mathematics
JAMB 1991
Find the positive number n, such that thrice its square is equal to twelve times the number
  • A. 1
  • B. 2
  • C. 3
  • D. 4
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Correct Answer: Option D
Explanation
3n2 = 12n

= 3n2 - 12n = 0

= 3n(n - 4) = 0

∴ n = 4
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