Consider, for example, the number 1048576, which is 2 raised to the 20th power, i.e. 2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2 = 1048576. Now, take the square root of 1048576, and you get 1024, which is 2 raised to the 10th power. So, the power has been cut in half. This is true in general, i.e. sqrt(a^b) = a^(b/2). Hope this helps!!