Divide both sides by \(4\).
\[{x}^{2}=-\frac{20}{4}\]
Simplify \(\frac{20}{4}\) to \(5\).
\[{x}^{2}=-5\]
Take the square root of both sides.
\[x=\pm \sqrt{-5}\]
Simplify \(\sqrt{-5}\) to \(\sqrt{5}\imath \).
\[x=\pm \sqrt{5}\imath \]
x=sqrt(5)*IM,-sqrt(5)*IM
