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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