\[f(x) = \sqrt{x - 2} + \frac{7}{x^{2} - 16}\]
\[\left\{ \begin{matrix}
x - 2 \geq 0\ \ \ \ \\
x^{2} - 16
eq 0 \\
\end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix}
x \geq 2\ \ \ \\
x
eq \pm 4 \\
\end{matrix} \right.\ \]
\[D(y) = \lbrack 2;4) \cup (4; + \infty).\]