Multiply both sides by \(3.2\).
\[20\times 3.2={V}^{2}-36\]
Simplify \(20\times 3.2\) to \(64\).
\[64={V}^{2}-36\]
Add \(36\) to both sides.
\[64+36={V}^{2}\]
Simplify \(64+36\) to \(100\).
\[100={V}^{2}\]
Take the square root of both sides.
\[\pm \sqrt{100}=V\]
Since \(10\times 10=100\), the square root of \(100\) is \(10\).
\[\pm 10=V\]
Switch sides.
\[V=\pm 10\]
V=10,-10
