ĐKXĐ:...
\(\Leftrightarrow x^2-6x+9+x-2-2\sqrt{x-2}+1=0\)
\(\Leftrightarrow\left(x-3\right)^2+\left(\sqrt{x-2}-1\right)^2=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-3=0\\\sqrt{x-2}-1=0\end{matrix}\right.\) \(\Rightarrow x=3\)
\( x^ 2 − 5 x + 8 = 2 \sqrt{ x − 2}\)
⇔x2−6x+9+x−2−2x−2+1=0
⇔(x−3)2+(x−2−1)2=0
⇔{x−3=0x−2−1=0