x^2 = 2 , is it true?

Ale · 2015-12-31, 07:20

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 ?

LaurV · 2015-12-31, 08:40

0.4472135955^2=0.20000000000003762025.
Try again.

Ale · 2015-12-31, 08:49

Google calculator is 0,2

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

but is Always two

LaurV · 2015-12-31, 09:01

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.

Ale · 2015-12-31, 09:10

thank you very much

Ale · 2015-12-31, 11:26

$(sqrt ({0.2*10}))$ ^{^2} = 2

science_man_88 · 2015-12-31, 13:20

Quote:

Originally Posted by Ale

$(sqrt ({0.2*10}))$ ^{^2} = 2

you do realize that all this does is cancel the sqrt and square symbols.

Ale · 2015-12-31, 21:05

Sorry , yes

jux · 2015-12-31, 22:39

Quote:

Originally Posted by LaurV

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!

ewmayer · 2016-01-01, 02:19

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.

NBtarheel_33 · 2016-01-02, 12:01

Come on now, everybody knows that $X^2 = 100$ . Don't you know anything about Roman numerals?

2015-12-31, 07:20	#1
Ale Nov 2015 5² Posts	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

2015-12-31, 08:49	#3
Ale Nov 2015 5² Posts	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

2015-12-31, 11:26	#6
Ale Nov 2015 5² Posts	$(sqrt ({0.210}))$ ^{^2} = 2 Last fiddled with by Ale on 2015-12-31 at 11:36*

2015-12-31, 21:05	#8
Ale Nov 2015 5² Posts	Sorry , yes Last fiddled with by Ale on 2015-12-31 at 21:06 Reason: wrong

2016-01-02, 12:01	#11
NBtarheel_33 "Nathan" Jul 2008 Maryland, USA 5×223 Posts	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

2015-12-31, 08:40	#2
LaurV Romulan Interpreter Jun 2011 Thailand 9379₁₀ Posts	0.4472135955^2=0.20000000000003762025. Try again.

2015-12-31, 09:01	#4
LaurV Romulan Interpreter Jun 2011 Thailand 83·113 Posts	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.

2015-12-31, 09:10	#5
Ale Nov 2015 5² Posts	thank you very much

2016-01-01, 02:19	#10
ewmayer ∂²ω=0 Sep 2002 República de California 2·5,813 Posts	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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