\[\sqrt{\frac{2}{x + 5}} = 3\]
\[\frac{2}{x + 5} = 3^{2}\]
\[\frac{2}{x + 5} = 9;\ \ \ \ x \neq - 5\]
\[9 \cdot (x + 5) = 2\]
\[9x + 45 = 2\]
\[9x = - 43\]
\[x = - \frac{43}{9} = - 4\frac{7}{9}.\]
\[Ответ:x = - 4\frac{7}{9}.\]