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Solve for x: (x\(^2\) + 2x + 1) = 25

Mathematics
WAEC 1989

Solve for x: (x\(^2\) + 2x + 1) = 25

  • A. -6, -4
  • B. 6, -4
  • C. 6, 4
  • D. -6, 4
  • E. 5, 5
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Correct Answer: Option D
Explanation

x\(^2\) + 2x + 1 = 25

x\(^2\) + 6x - 4x -24= 0

x(x + 6) - 4(x + 6) = 0

(x - 4)(x + 6) = 0

x = 4 or -6 

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