\[3x^{2} + 5x - 2 \leq 0\]
\[D = 25 + 24 = 49\]
\[x_{1} = \frac{- 5 + 7}{6} = \frac{2}{6} = \frac{1}{3};\ \]
\[x_{2} = \frac{- 5 - 7}{6} = - 2.\]
\[3 \cdot (x + 2)\left( x - \frac{1}{3} \right) \leq 0\]
\[Ответ:\ - 2 \leq x < 0.\]