\[3x² - 4x - 1 = 0\ \]
\[D = 16 + 12 = 28\]
\[x_{1,2} = \frac{4 \pm \sqrt{28}}{6} = \frac{4 \pm 2\sqrt{7}}{6} =\]
\[= \frac{2 \pm \sqrt{7}}{3}\]
\[Ответы:\ \ \frac{2 \pm \sqrt{7}}{3}\text{.\ }\]