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Ok here is my problem, I am not sure how to simplify surds with additions and subtractions in them such as ones like this:

http://img212.imageshack.us/img212/474/math010iz.gif [Broken]

At the moment I have managed to simplify it to this:

http://img212.imageshack.us/img212/2011/math026eg.gif [Broken]

However it is not simplified as possible, can someone give me some words of wisdom? Any help greatly appreciated!

http://img212.imageshack.us/img212/474/math010iz.gif [Broken]

At the moment I have managed to simplify it to this:

http://img212.imageshack.us/img212/2011/math026eg.gif [Broken]

However it is not simplified as possible, can someone give me some words of wisdom? Any help greatly appreciated!

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