Square Root Problem

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I have the answer to this problem from my book. but I have no idea how they got to that conclusion! Please help. The problem is as follows.

The square root of 4aE2 - 4a + 1

The answer that my book has is 2a-1. I know that the square and the square root cancel out, but I still don't understand how the answer was gotten.
 
Oh! I think I get it know. It seems really obvious now that I think of it, but, oh well. Thanks Matt! You've been a lot of help.
 
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