\[3y^{2} + 7y - 6 =\]
\[= 3\left( y - \frac{2}{3} \right)(y + 3) =\]
\[= (3y - 2)(y + 3.\]
\[D = 49 + 72 = 121\]
\[y_{1} = \frac{- 7 + 11}{6} = \frac{4}{6} = \frac{2}{3};\]
\[y_{2} = \frac{- 7 - 11}{6} = - 3.\]