Algebra

First we simplify the radicals in the parenthesis. 

$\sqrt{5} = \sqrt{5}$

$\sqrt{45} = 3\sqrt{5}$

$\sqrt{125} = 5\sqrt{5}$

$\sqrt{80}=4\sqrt{5}$

Since we are adding up the radicals, our new expression is:

$(\sqrt{5} + 3\sqrt{5} +5\sqrt{5}+ 4\sqrt{5})^2$

Simplifying we get:

$(13\sqrt{5})^2$

This simplifies to:

845 which is the answer.