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WAEC Mathematics 2012 Question 35

Question 35

Algebraic Expressions

Find the coefficient of m in the expansion of (m/2 − 1½)(m + 2/3).

  1. A.−1/6
  2. B.−1/2
  3. C.−1
  4. D.−1⅙
Show the answer and explanation

Answer: D (−1⅙)

Explanation

The m-terms are (m/2)(2/3) = m/3 and (−3/2)(m) = −3m/2. Coefficient = 1/3 − 3/2 = −7/6 = −1⅙.