Solve $x^{2}=21$, where $x$ is a real number. Simplify your answer as much as possible.
The two possible values for x are: \(\boxed{\pm \sqrt{21}}\)
Step 1 :Solve the equation: \(x^2 = 21\)
Step 2 :The two possible values for x are: \(\boxed{\pm \sqrt{21}}\)