\[x^{2} - 6x + 2 = 0\]
\[\frac{x_{1}}{x_{2}} + \frac{x_{2}}{x_{1}} + 2 = \frac{x_{1}^{2} + x_{2}^{2} + 2x_{1}x_{2}}{x_{1}x_{2}} =\]
\[= \frac{\left( x_{1} + x_{2} \right)^{2}}{x_{1}x_{2}} = \frac{6^{2}}{2} = \frac{36}{2} = 18.\]