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WAEC Mathematics 1995 Question 11

Question 11

Algebraic Expressions

Find the values of x for which the expression is underlined: (6x − 1)/(x2 + 4x − 5)

  1. A.+4 or +1
  2. B.−5 or +1
  3. C.−5 or −1
  4. D.+5 or −1
  5. E.+4 or − 1
Show the answer and explanation

Answer: B (−5 or +1)

Explanation

The expression is undefined when the denominator is zero: x² + 4x − 5 = (x + 5)(x − 1) = 0, so x = −5 or x = 1.