\[\sqrt{x + 5} + \frac{1}{x - 3}\]
\[x + 5 \geq 0\]
\[x \geq - 5\]
\[x - 3 \neq 0;\ \ x \neq 3\]
\[Ответ:\ \left\lbrack - 5;3) \cup (3;\ + \infty) \right.\ \]