\[6x^{2} + 5x - 4 =\]
\[= 6 \cdot \left( x - \frac{1}{2} \right)\left( x + \frac{4}{3} \right) =\]
\[= (2x - 1)(3x + 4)\]
\[6x^{2} + 5x - 4 = 0\]
\[D = 25 + 96 = 121\]
\[x_{1} = \frac{- 5 + 11}{12} = \frac{6}{12} = \frac{1}{2};\ \ \ \]
\[x_{2} = \frac{- 5 - 11}{12} = - \frac{16}{12} = - \frac{4}{3}\]