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?

  • 3, 1
  • -1, -3
  • -1, 3 checkmark
  • 3, -2
  • 1, -3

The correct answer is: 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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