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JAMB Mathematics 1979 Question 26

Question 26

Algebraic Expressions

Make c the subject of the equation a(b + c) + 5/d − 2 = 0

  1. A.c = (2d − 5 − b)/ad
  2. B.c = (5 − 2d − b)/ad
  3. C.c = (5 − 2d − abd)/ad
  4. D.c = (2d − 5 − abd)/ad
  5. E.c = (2d − ab − 5)/ad
Show the answer and explanation

Answer: D (c = (2d − 5 − abd)/ad)

Explanation

Multiply by d: abd + acd + 5 − 2d = 0, so acd = 2d − 5 − abd and c = (2d − 5 − abd)/ad.