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Old 2015-12-31, 07:20   #1
Ale
 
Nov 2015

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Red face x^2 = 2 , is it true?

italian Language :

Secondo me esiste un numero razionale tale che x^2 = 2 ed è la radice quadrata di 0,2 che è 0,4472135955 , mi spiego meglio 2 e 0,2 rappresentano entrambi due unità ,
quindi x^2 = 2 è possibile perché chiede 2 unità e non il numero 2 inteso come numero intero , quindi 0,4472135955^2 = 0,2 = che appunto sono 2 unità , cosa ne pensate ?

Google translate :

I think there is a rational number such that x ^ 2 = 2 and is the square root of 0.2 that is 0.4472135955, I'll explain 2 and 0.2 are both two units,
then x ^ 2 = 2 is possible because it requires 2 units and the number 2 is understood as an integer, then 0.4472135955 ^ 2 = 0.2 = 2 units that are in fact, what you think ?

Last fiddled with by Ale on 2015-12-31 at 07:22
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Old 2015-12-31, 08:40   #2
LaurV
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0.4472135955^2=0.20000000000003762025.
Try again.
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Old 2015-12-31, 08:49   #3
Ale
 
Nov 2015

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Google calculator is 0,2

0.2 = 2/10 of units?
2 = two units ?

but is Always two

Last fiddled with by Ale on 2015-12-31 at 08:58
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Old 2015-12-31, 09:01   #4
LaurV
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Google calculator is a part of a world conspiracy, to cheat you. They want you to be stupid, so they can lead you easier. Take the pencil and multiply by yourself.
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Old 2015-12-31, 09:10   #5
Ale
 
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thank you very much
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Old 2015-12-31, 11:26   #6
Ale
 
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(sqrt ({0.2*10}))^2 = 2

Last fiddled with by Ale on 2015-12-31 at 11:36
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Old 2015-12-31, 13:20   #7
science_man_88
 
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Quote:
Originally Posted by Ale View Post
(sqrt ({0.2*10}))^2 = 2
you do realize that all this does is cancel the sqrt and square symbols.
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Old 2015-12-31, 21:05   #8
Ale
 
Nov 2015

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Sorry , yes

Last fiddled with by Ale on 2015-12-31 at 21:06 Reason: wrong
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Old 2015-12-31, 22:39   #9
jux
 
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Quote:
Originally Posted by LaurV View Post
Google calculator is a part of a world conspiracy, to cheat you. They want you to be stupid, so they can lead you easier. Take the pencil and multiply by yourself.
Not just Google, but the accursed IEEE and their "floating point formats", aka introducing hidden errors everywhere to slow down technological progress!
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Old 2016-01-01, 02:19   #10
ewmayer
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Ah, nothing like a hilarious joke-thread to end the year with.

Continuing with the good fun, OP banned until he satisfactorily completes the elementary proof of the irrationality of sqrt(2) along the lines which I PMed him (this is still very basic, but different than the 'classical' ancient-Greek-era proof, to ensure he can't just copy/paste an answer.) I cc'ed the other mods on my ban-PM to him containing his un-ban homework assignment. Consider it incentivization to actually learn some basic maths.
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Old 2016-01-02, 12:01   #11
NBtarheel_33
 
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Come on now, everybody knows that X^2 = 100. Don't you know anything about Roman numerals?

Last fiddled with by NBtarheel_33 on 2016-01-02 at 12:01
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