\[\frac{1}{x_{1}}\ и\ \ \frac{1}{x_{2}} - корни\ уравнения.\]
\[\frac{1}{x_{1}} + \frac{1}{x_{2}} = \frac{x_{2} + x_{1}}{x_{1} \cdot x_{2}} = - \frac{9}{17}\]
\[\frac{1}{x_{1}} \cdot \frac{1}{x_{2}} = \frac{1}{x_{1} \cdot x_{2}} = - \frac{1}{17} \Longrightarrow\]
\[\Longrightarrow x^{2} + \frac{9}{17}x - \frac{1}{17} = 0.\]