maths
posted by anonymous .
rationalise 5+2square root 5 divided by square root 5.
please can someone help me on how to get the answer 2+square root 5

(5+2sqrt5)/sqrt5 * (sqrt5/sqrt5)=
(2*sqrt5*sqrt5+5sqrt5)/(sqrt5*sqrt5)=
(2*5+5sqrt5)/5=2+sqrt5 
but how do you get 2*5+5squared root 5 to become 2+sqrt5 ?