\[(x - 3)^{2} = 2\]
\[(x - 3)^{2} = \left( \sqrt{2} \right)^{2}\]
\[x - 3 = \sqrt{2}\]
\[x = \sqrt{2} + 3.\]
\[x - 3 = - \sqrt{2}\]
\[x = 3 - \sqrt{2}.\]
\[Ответ:x = 3 \pm \sqrt{2}.\]