\[\frac{x + 2\sqrt{5x} + 5}{x - 5} =\]
\[= \frac{\left( \sqrt{x} + \sqrt{5} \right)^{2}}{\left( \sqrt{x} - \sqrt{5} \right)\left( \sqrt{x} + \sqrt{5} \right)} =\]
\[= \frac{\sqrt{x} + \sqrt{5}}{\sqrt{x} - \sqrt{5}}.\]