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JAMB Mathematics 2012 Question 21

Question 21

Binary Operations

The binary operation * is defined on the set of integers such that p * q = pq + p − q. Find 2*(3*4).

  1. A.11
  2. B.13
  3. C.15
  4. D.22
Show the answer and explanation

Answer: B (13)

Explanation

3 * 4 = 12 + 3 − 4 = 11. Then 2 * 11 = 22 + 2 − 11 = 13.