ĐKXĐ: \(x\ge3\)
pt <=> \(\left(x-3\right)-2\sqrt{x-3}+1=1\)
<=> \(\left(\sqrt{x-3}-1\right)^2=1\)
<=> \(\left[{}\begin{matrix}\sqrt{x-3}=0\\\sqrt{x-3}=2\end{matrix}\right.\)
<=> \(\left[{}\begin{matrix}x-3=0\\x-3=4\end{matrix}\right.\)
<=> \(\left[{}\begin{matrix}x=3\\x=7\end{matrix}\right.\left(TM\right)}\)