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The larger value of y for which (y - 1)2 = 4y - 7 is

Mathematics
JAMB 1984
The larger value of y for which (y - 1)2 = 4y - 7 is
  • A. 2
  • B. 4
  • C. 6
  • D. 7
  • E. 8
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Correct Answer: Option B
Explanation
(y - 1)2 = 4y - 7

y2 - 2xy + 1 = 4y - 7

y2 - 6y + 8 = 0

(y - 4)(y - 2)

y = 4 or 2 = 4
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