Ответ:
\[3x^{2} + 11x - 20 = 0\]
\[D = 121 + 240 = 361\]
\[x_{1} = \frac{- 11 + 19}{6} = \frac{8}{6} = \frac{4}{3} = 1\frac{1}{3};\]
\[x_{2} = \frac{- 11 - 19}{6} = - 5.\]
\[Ответ:\ \ x = - 5;\ \ x = 1\frac{1}{3}.\]
\[3x^{2} + 11x - 20 = 0\]
\[D = 121 + 240 = 361\]
\[x_{1} = \frac{- 11 + 19}{6} = \frac{8}{6} = \frac{4}{3} = 1\frac{1}{3};\]
\[x_{2} = \frac{- 11 - 19}{6} = - 5.\]
\[Ответ:\ \ x = - 5;\ \ x = 1\frac{1}{3}.\]