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September 24, 2025, 05:04:02 pm
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Author Topic: Is this simplifyable?  (Read 4823 times)  Share 

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the.watchman

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Re: Is this simplifyable?
« Reply #45 on: March 15, 2010, 06:19:45 am »
0
Quote from: Mao on March 15, 2010, 12:22:17 am
I agree with /0, the case that is not because the square roots are multivalued. If that was the case, it would be expressed as [see how it's multivalued?] HOWEVER, this is not true.

The square root function is defined as the positive branch, the fact that it returns the absolute value is because is not one-to-one, and whenever a negative value is substituted, a positive value is returned (hence, absolute).

Quote from: kenhung123 on March 13, 2010, 07:15:20 pm
But I thought the root of x^2 is the positive only?
^^ that statement is correct, hence you cannot say , because this means the root could be negative (for )

YES thank you for confirmation :)
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TrueTears

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Re: Is this simplifyable?
« Reply #46 on: March 16, 2010, 08:51:34 am »
0
Quote from: kamil9876 on March 14, 2010, 11:27:01 pm
quite frankly I don't really care. I'm more worried about the pedantic and elitist image of 'uni maths' that has probably scared future generations and may possibly cause loss of some great talent.

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we learn this in uni maths?...i dont look foward to it... :(
exactly, definitions are just definitions.
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