Subtract \(75\) from both sides.
\[-3{x}^{2}=-75\]
Divide both sides by \(-3\).
\[{x}^{2}=\frac{-75}{-3}\]
Two negatives make a positive.
\[{x}^{2}=\frac{75}{3}\]
Simplify \(\frac{75}{3}\) to \(25\).
\[{x}^{2}=25\]
Take the square root of both sides.
\[x=\pm \sqrt{25}\]
Since \(5\times 5=25\), the square root of \(25\) is \(5\).
\[x=\pm 5\]
x=5,-5
