\[3x^{2} + x - 4 = 0\]
\[D = 1 + 48 = 49\]
\[x_{1} = \frac{- 1 + 7}{6} = 1;\ \]
\[x_{2} = \frac{- 1 - 7}{6} = - \frac{8}{6} = - \frac{4}{3} = - 1\frac{1}{3};\]
\[1 - \left( - 1\frac{1}{3} \right) = 1 + 1\frac{1}{3} = 2\frac{1}{3}.\]