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For what value of x is the expression x - 5/x2 - 2x - 3...

Mathematics
WAEC 1998
For what value of x is the expression
x - 5/x2 - 2x - 3
not defined?
  • A. 3, 1
  • B. -1, -3
  • C. -1, 3
  • D. 3, -2
  • E. 1, -3
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Correct Answer: Option C
Explanation
x2 - 2x - 3 = 0
x2 - 3x + x - 3 = 0
x(x - 3) + (x - 3) = 0
(x + 1)(x - 3) = 0
x = -1 or 3
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