Nên \(\left[{}\begin{matrix}\sqrt{x}-3=1\\\sqrt{x}-3=-1\\\sqrt{x}-3=2\\\sqrt{x}-3=-2\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}\sqrt{x}=4\\\sqrt{x}=2\\\sqrt{x}=5\\\sqrt{x}=1\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=16\\x=4\\x=25\\x=1\end{matrix}\right.\)