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WAEC Mathematics 2003 Question 25

Question 25

Algebraic Expressions

Find the values of x for which 1/(2x2 − 13x + 15) is not defined,

  1. A.5 or 3/2
  2. B.1 or 15/13
  3. C.2 or 15
  4. D.13 or 15
Show the answer and explanation

Answer: A (5 or 3/2)

Explanation

The denominator 2x2 − 13x + 15 = (2x − 3)(x − 5) is zero when x = 3/2 or 5.