distributeing a radical

I need help
(a+b)^2=a^2+2ab+b^2
this is obvious but what is this
(a+b)^1/2=?
i herd once that you can distribute a radical but i nevergot to ask this guy how am i being lied to and if not can you tell me how to do this?

You're gonna need a lot of paper for that one bro.

Can't be done as far as I know unless you wanna write it as a series.

http://www.wolframalpha.com/input/?i=(a%2Bb)^1%2F2