a simple form of : 2√5+4

As follows:

\(\frac{2\sqrt5+4}{2\sqrt5-4}\rightarrow\frac{(2\sqrt5+4)^2}{(2\sqrt5-4)(2\sqrt5+4)}\rightarrow\frac{4\times5+2\times2\sqrt5\times4+16}{4*5-16}\rightarrow\frac{36+16\sqrt5}{4}\rightarrow9+4\sqrt5\)

.