\[\boxed{\mathbf{730\ (730).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 7x² + 11x - 18 = 0\]
\[x_{1} + x_{2} = - \frac{11}{7},\ \ \]
\[x_{1} = - \frac{18}{7} = - 2\frac{4}{7}\]
\[x_{1} \cdot x_{2} = - \frac{18}{7},\ \ x_{2} = 1\]
\[Ответ:\ \ x = - 2\frac{4}{7};x = 1.\]
\[2)\ 9x² - 5x - 4 = 0\]
\[x_{1} + x_{2} = \frac{5}{9},\ \ x_{1} = - \frac{4}{9}\]
\[x_{1} \cdot x_{2} = - \frac{4}{9},\ \ x_{2} = 1\]
\[Ответ:\ x = - \frac{4}{9};x = 1.\]