passwella.
Menu

WAEC Mathematics 2002 Question 21

Question 21

Algebraic Expressions

For what values of x is the expression (3x − 2)/(4x2 + 9x − 9) undefined?

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

Answer: D (3/4 or −3)

Explanation

The denominator 4x2 + 9x − 9 = (4x − 3)(x + 3) is zero when x = 3/4 or x = −3.