\[f(x) = \sqrt{x + 2\ } + \frac{x - 7}{x^{2} - 4}\ \]
\[\left\{ \begin{matrix}
x + 2 \geq 0 \\
x^{2}
eq 4\ \ \ \ \ \ \\
\end{matrix}\text{\ \ \ \ \ \ \ \ } \right.\ \]
\[\left\{ \begin{matrix}
x \geq - 2 \\
x
eq \pm 2 \\
\end{matrix} \right.\ \]
\[\Longrightarrow ( - 2;\ \ 2) \cup (2;\ + \infty).\]