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You are not logged in. #1 20130717 06:56:38
Why is the square root of (x+y)^2 not (xy)?Hi again, this question may seem silly, but I'm confused. #2 20130717 07:08:46
Re: Why is the square root of (x+y)^2 not (xy)?Hi atran; In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #4 20130717 07:45:21
Re: Why is the square root of (x+y)^2 not (xy)?That is only two distinct ways. In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #5 20130719 02:54:36
Re: Why is the square root of (x+y)^2 not (xy)?I still don't get it. I learned that √(x) or x^(1/2) is the principal square root of x. #6 20130719 03:03:20
Re: Why is the square root of (x+y)^2 not (xy)?Hi;
Who says you should only use the principal root in this case. That would only get one root, a quadratic has 2 roots. See post #2 In mathematics, you don't understand things. You just get used to them. I have the result, but I do not yet know how to get it. All physicists, and a good many quite respectable mathematicians are contemptuous about proof. #7 20130726 20:50:51
Re: Why is the square root of (x+y)^2 not (xy)?It is simple. Here we are dealing with the polynomial of degree "2" so when we will take a an under root on both sides, we will find two solutions of x one with a positive sign and one with negative sign. 