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WAEC Mathematics 2019 Question 11

Question 11

Algebraic Expressions

If m : n = 2 : 1, evaluate (3m2 − 2n2)/(m2 + mn)

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

Answer: B (5/3)

Explanation

Put m = 2 and n = 1: (12 − 2)/(4 + 2) = 10/6 = 5/3.