\[4x^{2} - 11x - 3 \leq 0\]
\[D = 121 + 48 = 169\]
\[x_{1} = \frac{11 + 13}{8} = 3;\ \ \]
\[x_{2} = \frac{11 - 13}{8} = - \frac{2}{8} = - \frac{1}{4} =\]
\[= - 0,25.\]
\[Ответ:при\ - 0,25 \leq x < 0.\]