# Please Help with the proof of Arithmetic and Geometric mean theorem?

This one website proves the theorem, but I don't understand one part.

Here is the website:

http://jwilson.coe.uga.edu/emt725/AMGM/AMGM.3.html

I was wondering why are you allowed to add "4ab" to each side? Where does the "4ab" come from?

Thanks in advance.

Here is the website:

http://jwilson.coe.uga.edu/emt725/AMGM/AMGM.3.html

I was wondering why are you allowed to add "4ab" to each side? Where does the "4ab" come from?

Thanks in advance.

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