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WAEC Further Mathematics 2026 Question 34

Question 34

Binary Operations

An operation * defined on the set of positive real numbers is given by x * y = yx/7, find the inverse of x.

  1. A.49/x
  2. B.−49/x
  3. C.−x/49
  4. D.x/49
Show the answer and explanation

Answer: A (49/x)

Explanation

Identity: x * e = xe/7 = x gives e = 7. Inverse: x × x⁻¹/7 = 7, so x⁻¹ = 49/x.