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