JAMB Mathematics 1992 Question 36

Question 36

Differentiation

Evaluate limx→2 (x − 2)(x2 + 3x − 2)/(x2 − 4)

  1. A.0
  2. B.2
  3. C.3
  4. D.4
Show the answer and explanation

Answer: B (2)

Explanation

Cancel (x − 2) using x2 − 4 = (x − 2)(x + 2). The limit is (4 + 6 − 2)/(2 + 2) = 8/4 = 2.