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September 24, 2025, 03:25:53 pm
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Author Topic: Is this simplifyable?  (Read 4821 times)  Share 

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TrueTears

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Re: Is this simplifyable?
« Reply #30 on: March 13, 2010, 09:48:32 pm »
0
Quote from: the.watchman on March 13, 2010, 09:47:33 pm
Quote from: TrueTears on March 13, 2010, 09:44:44 pm
Quote from: the.watchman on March 13, 2010, 09:43:23 pm
THIS IS A FAIL TEXTBOOK FOR YOUR INFORMATION!!! :D

If x=-3,
no...



Erm ... isn't it (because of +ve square root?)
not rly...

where would the fallacy be in my step then?

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physics

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Re: Is this simplifyable?
« Reply #31 on: March 13, 2010, 09:49:05 pm »
0
Quote from: TrueTears on March 13, 2010, 09:47:44 pm
the reason in methods is because the square roots are multivalued, thus the modulus get's rid of this misconception. You will learn more about it in uni.
we learn this in uni maths?...i dont look foward to it...:(
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the.watchman

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Re: Is this simplifyable?
« Reply #32 on: March 13, 2010, 09:52:17 pm »
0
Quote from: TrueTears on March 13, 2010, 09:48:32 pm
Quote from: the.watchman on March 13, 2010, 09:47:33 pm
Quote from: TrueTears on March 13, 2010, 09:44:44 pm
Quote from: the.watchman on March 13, 2010, 09:43:23 pm
THIS IS A FAIL TEXTBOOK FOR YOUR INFORMATION!!! :D

If x=-3,
no...



Erm ... isn't it (because of +ve square root?)
not rly...

where would the fallacy be in my step then?

No idea >.<
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TrueTears

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Re: Is this simplifyable?
« Reply #33 on: March 13, 2010, 09:52:48 pm »
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there isn't and both are right :)
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kenhung123

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Re: Is this simplifyable?
« Reply #34 on: March 13, 2010, 09:54:32 pm »
0
Quote from: TrueTears on March 13, 2010, 09:48:32 pm
Quote from: the.watchman on March 13, 2010, 09:47:33 pm
Quote from: TrueTears on March 13, 2010, 09:44:44 pm
Quote from: the.watchman on March 13, 2010, 09:43:23 pm
THIS IS A FAIL TEXTBOOK FOR YOUR INFORMATION!!! :D

If x=-3,
no...



Erm ... isn't it (because of +ve square root?)
not rly...

where would the fallacy be in my step then?


Maybe need to follow BEDMAS
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TrueTears

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Re: Is this simplifyable?
« Reply #35 on: March 13, 2010, 09:57:50 pm »
0
ok.
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the.watchman

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Re: Is this simplifyable?
« Reply #36 on: March 13, 2010, 09:58:20 pm »
0
Quote from: TrueTears on March 13, 2010, 09:52:48 pm
there isn't and both are right :)

LOL :D
Call it a draw this time ;)

(actually, is it ok to skip from to ?
it should be right, but that seems to be where we diverge :P)
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TrueTears

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Re: Is this simplifyable?
« Reply #37 on: March 13, 2010, 10:04:26 pm »
0
i didn't skip anything
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/0

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Re: Is this simplifyable?
« Reply #38 on: March 13, 2010, 10:11:01 pm »
0
isn't defined as the positive root?
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the.watchman

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Re: Is this simplifyable?
« Reply #39 on: March 13, 2010, 10:11:42 pm »
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Quote from: /0 on March 13, 2010, 10:11:01 pm
isn't defined as the positive root?

Yeah, so the answer should be positive...
Oh whatever! :P
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TrueTears

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Re: Is this simplifyable?
« Reply #40 on: March 13, 2010, 10:12:53 pm »
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Quote from: /0 on March 13, 2010, 10:11:01 pm
isn't defined as the positive root?
definitions?
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/0

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Re: Is this simplifyable?
« Reply #41 on: March 13, 2010, 10:13:40 pm »
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Quote from: TrueTears on March 13, 2010, 10:12:53 pm
Quote from: /0 on March 13, 2010, 10:11:01 pm
isn't defined as the positive root?
definitions?


"Every non-negative real number x has a unique non-negative square root,
called the principal square root, which is denoted with a radical sign as "

- Wikipedia
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TrueTears

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Re: Is this simplifyable?
« Reply #42 on: March 13, 2010, 10:14:23 pm »
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i wonder what kamil would say about this
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kamil9876

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Re: Is this simplifyable?
« Reply #43 on: March 14, 2010, 11:27:01 pm »
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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.

Quote
we learn this in uni maths?...i dont look foward to it... :(
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Re: Is this simplifyable?
« Reply #44 on: March 15, 2010, 12:22:17 am »
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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 )
« Last Edit: March 15, 2010, 12:24:00 am by Mao »
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