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JAMB Mathematics 2007 Question 18

Question 18

Algebraic Expressions

Make L the subject of the formula if d = √(42W/5L)

  1. A.√(42W/5d)
  2. B.42W/5d2
  3. C.42/5dW
  4. D.(1/d)√(42W/5)
Show the answer and explanation

Answer: B (42W/5d2)

Explanation

Square both sides: d2 = 42W/(5L), so 5Ld2 = 42W and L = 42W/(5d2).