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JAMB Mathematics 1986 Question 22

Question 22

Algebraic Expressions

Simplify 1/(5x + 5) + 1/(7x + 7)

  1. A.12/(35x + 7)
  2. B.1/(35(x + 1))
  3. C.12x/(35(x + 1))
  4. D.12/(35x + 35)
Show the answer and explanation

Answer: D (12/(35x + 35))

Explanation

1/(5(x + 1)) + 1/(7(x + 1)) = (7 + 5)/(35(x + 1)) = 12/(35x + 35).