Question 12

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Jambmaths question: 

Make l  the subject of the formula $d=\sqrt{\frac{42w}{5l}}$

Option A: 

$\tfrac{42}{5dw}$

Option B: 

$\sqrt{\tfrac{42w}{5d}}$

Option C: 

$\tfrac{42w}{5d}$

Option D: 

$\tfrac{1}{d}\sqrt{\tfrac{42w}{5}}$

Jamb Maths Solution: 

$\begin{align}  & d=\sqrt{\frac{42w}{5l}} \\ & \text{Square both sides} \\ & {{d}^{2}}=\frac{42w}{5l} \\ & \text{Multiply both sides by }l \\ & {{d}^{2}}l=\frac{42w}{5} \\ & \text{Divide both sides by }{{d}^{2}} \\ & l=\frac{42w}{5{{d}^{2}}} \\\end{align}$

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