Solve for D
\left\{\begin{matrix}D=\frac{V}{4\sqrt{d}}\text{, }&d>0\\D\in \mathrm{R}\text{, }&d=0\text{ and }V=0\end{matrix}\right.
Solve for V
V=4\sqrt{d}D
d\geq 0
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V=4\sqrt{d}D
Calculate the square root of 16 and get 4.
4\sqrt{d}D=V
Swap sides so that all variable terms are on the left hand side.
\frac{4\sqrt{d}D}{4\sqrt{d}}=\frac{V}{4\sqrt{d}}
Divide both sides by 4\sqrt{d}.
D=\frac{V}{4\sqrt{d}}
Dividing by 4\sqrt{d} undoes the multiplication by 4\sqrt{d}.
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