Answer
$x=81$
Work Step by Step
The given equation is
$\Rightarrow \sqrt{x}=9$
Square each side of the equation.
$\Rightarrow (\sqrt{x})^2=9^2$
Simplify.
$\Rightarrow x=81$
Check $x=81$.
$\Rightarrow \sqrt{x}=9$
$\Rightarrow \sqrt{81}=9$
$\Rightarrow 9=9$
True.
Hence, the solution is $x=81$.
