## Intermediate Algebra (12th Edition)

$\bf{\text{Solution Outline:}}$ Substitute the given value for $x$ in the given equation, $\sqrt{x}=-3 .$ If the left side of the equation becomes equal to the right side of the equation, then the given value of $x$ is a solution to the equation. $\bf{\text{Solution Details:}}$ Substituting $x$ with $9$ in the given equation results to \begin{array}{l}\require{cancel} \sqrt{9}=-3 \\\\ 3=-3 \text{ (FALSE)} .\end{array} Hence, $x= 9$ is NOT a solution to the given equation.