\[6x² + x - 1 = 0\]
\[D = 1 + 24 = 25\]
\[x_{1} = \frac{- 1 + 5}{12} = \frac{4}{12} = \frac{1}{3};\ \ \ \]
\[x_{2} = \frac{- 1 - 5}{12} = - \frac{6}{12} = - 0,5.\]
\[Ответ:\ x = \frac{1}{3};\ x = - 0,5.\]