\[\sqrt{3x + 11} + \frac{5}{\sqrt{4 - x}}\]
\[\left\{ \begin{matrix}
3x + 11 \geq 0 \\
4 - x > 0\ \ \ \ \ \\
\end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix}
3x \geq - 11 \\
- x > - 4\ \ \\
\end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix}
x \geq - \frac{11}{3} \\
x < 4\ \ \ \ \ \\
\end{matrix} \right.\ \]
\[Ответ:\ x \in \left\lbrack - 3\frac{2}{3};4 \right).\]