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What is this I don't even - Algebraic "proof" that 2+2=5
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LOON_ATTIC Offline
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Post: #1
What is this I don't even - Algebraic "proof" that 2+2=5

fucking algebra, how does it work
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Can anyone find a flaw on this thing? I couldn't. It's when s/he takes square roots of both sides and adds 9/2 that my mind blows.
THEY'RE STILL BOTH EQUAL TO 1/4 or 0.25 WHEN CALCULATEDS, without doing shit to both sides.
But what the fuck. What s/he did wasn't illegal, you know?

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04-29-2011 04:18 PM
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Hannah-chan Offline
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Post: #2
Re: What is this I don't even - Algebraic "proof" that 2+2=5

The mistake is when she adds 8.25 to both sides - she pulls the figure from nowhere, and it messes up the balance of the sum. The figures added should be different.

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04-29-2011 06:13 PM
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___________________ Offline
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Post: #3
Re: What is this I don't even - Algebraic "proof" that 2+2=5

using this same math anything can equal whatever you want. Its called dividing by zero. What Dividing by zero DOES do is prove math wrong altogether, but some asshole just decided to say "LOL NUP U CUNT DU THUT"
04-30-2011 07:51 AM
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Thought Criminal Offline
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Post: #4
Re: What is this I don't even - Algebraic "proof" that 2+2=5



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04-30-2011 12:08 PM
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LOON_ATTIC Offline
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Post: #5
Re: What is this I don't even - Algebraic "proof" that 2+2=5

Dividing by zero? Different figures?
I though it was taking the square root of a negative number, after thinking about it some more. But meh.

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04-30-2011 12:21 PM
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Thought Criminal Offline
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

It's a mathematical fallacy. It will work with any set of numbers.
04-30-2011 12:30 PM
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aaaaaaasd Offline
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

is it bad that i didn't get any of that
04-30-2011 07:27 PM
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The Desert Fox Offline
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Post: #8
Re: What is this I don't even - Algebraic "proof" that 2+2=5

BaronVonStrangle Wrote:is it bad that i didn't get any of that

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SaintVicious Offline
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Post: #9
Re: What is this I don't even - Algebraic "proof" that 2+2=5

http://img01.lachschon.de/images/59155_ ... od_now.jpg
05-02-2011 02:14 PM
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xenoknight Offline
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Post: #10
Re: What is this I don't even - Algebraic "proof" that 2+2=5

This "proof" ignores the negative roots. You must account for the negative root.

Let's test the final result though(just for fun):

2+2 = 5
2+2-5 = 0
4-5 = 0
-----------
-1 = 0
^untrue statement

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05-04-2011 06:22 AM
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aaaaaaasd Offline
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Post: #11
Re: What is this I don't even - Algebraic "proof" that 2+2=5

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07-12-2011 12:37 AM
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Efs Offline
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Post: #12
Re: What is this I don't even - Algebraic "proof" that 2+2=5

The only Math I do is work out the amount of rage I feel when I go to Math class.

(01-10-2012 02:15 PM)Maelstrom Wrote:  Efs, your nihilism is beautiful.
07-12-2011 12:42 AM
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UnschoolShqiponjë Offline
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Post: #13
Re: What is this I don't even - Algebraic "proof" that 2+2=5

Hannah-chan Wrote:The mistake is when she adds 8.25 to both sides - she pulls the figure from nowhere, and it messes up the balance of the sum.

This.

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07-12-2011 11:35 AM
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magikarp Offline
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Post: #14
Re: What is this I don't even - Algebraic "proof" that 2+2=5

UnschoolShqiponjë Wrote:
Hannah-chan Wrote:The mistake is when she adds 8.25 to both sides - she pulls the figure from nowhere, and it messes up the balance of the sum.

This.
No, that part is actually valid; you can add or subtract the same number from both sides of an equation without affecting the equality.

If you imagine a very simple equation,

x = y

And then add some arbitrary value to both sides,

x + 4 = y + 4
x + (-5) = y + (-5)
x + 5/3 = y + 5/3

It's pretty clear that the equation remains true. And since you can let x and y stand for some particular values (even values represented by more complicated expressions), you can tell how it remains true in the general case.

Like other people said, the actual problem is with the step where you take the square root.

You can simplify the expression

(4 - 9/2)^2 = (5 - 9/2)^2

to

(-1/2)^2 = (1/2)^2

and that is obviously true. But since for some arbitrary value x, both x*x and -x*-x give the value x^2, to preserve the equality you have to take the absolute value of each side. So,

|(4 - 9/2)| = |(5 - 9/2)|
|-1/2| = |1/2|
1/2 = 1/2

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07-18-2011 02:11 PM
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Prince Rilian Offline
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Post: #15
Re: What is this I don't even - Algebraic "proof" that 2+2=5

It's because square roots have two answers.

(-1)^2 = 1 and (1)^2 = 1, oh no this must mean that -1 = 1 !

Life is good. Jeta është e mirë. Goingcrazy
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07-18-2011 02:43 PM
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Absnt Offline
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

Conclusions?

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07-18-2011 03:53 PM
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IllusoryDeath Away
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

Absentinsomniac Wrote:Conclusions?

MATHS HURT BRAAAAAIN.
07-19-2011 05:14 AM
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LOON_ATTIC Offline
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Post: #18
Re: What is this I don't even - Algebraic "proof" that 2+2=5

Prince Rilian Wrote:It's because square roots have two answers.

(-1)^2 = 1 and (1)^2 = 1, oh no this must mean that -1 = 1 !
dis
Because basically thing above means that (1/2)*2 = (-(1/2))*2 (when * is a power of something).

The things that are squared are brought to be the same absolute value but one positive and the other negative after being factored.
This just brings a problem when taking square roots of shit (or quadruple, sextuple, so on) when solving/simplifying equations, I guess the thing that's being squared always has to be positive?
Hopefully not absolutely everyone's head will explode after reading this Shrug

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07-19-2011 05:37 AM
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TheHate Offline
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

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07-23-2011 07:30 AM
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thewake Offline
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

TheHate Wrote:[Image: 50272_87342802412_2175583_n.jpg]
Algebra finally makes sense!

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07-23-2011 07:35 AM
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Prince Rilian Offline
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Re: What is this I don't even - Algebraic "proof" that 2+2=5

Lunatic Wrote:
Prince Rilian Wrote:It's because square roots have two answers.

(-1)^2 = 1 and (1)^2 = 1, oh no this must mean that -1 = 1 !
dis
Because basically thing above means that (1/2)*2 = (-(1/2))*2 (when * is a power of something).

The things that are squared are brought to be the same absolute value but one positive and the other negative after being factored.
This just brings a problem when taking square roots of shit (or quadruple, sextuple, so on) when solving/simplifying equations, I guess the thing that's being squared always has to be positive?
Hopefully not absolutely everyone's head will explode after reading this Shrug
That's why when you're solving an equation with even roots, you have to put plus or minus, you have include both possibilities.

Life is good. Jeta është e mirë. Goingcrazy
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07-23-2011 07:54 AM
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N0nLifer Offline
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Post: #22
Re: What is this I don't even - Algebraic "proof" that 2+2=5

LOL! Now ima gonna PROLLY trol at maths sayng that 2+2=5.
Then ima gonna prove to my teacher that its true.
Btw nice vid Thought Criminal
08-04-2011 03:38 PM
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Mather Offline
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RE: What is this I don't even - Algebraic "proof" that 2+2=5

look it's pretty simple sqrt(x^2) is not equal to x but equal to |x| therefore when he put sqrt passing from step 3 -> 4 he forgot the ||
03-09-2015 01:04 AM
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Chanku Offline
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What is this I don't even - Algebraic "proof" that 2+2=5

Mather...why did you even bump this thread? Please look at the date of the last post before posting...

Pretty Much my only signature...I'm mainly a lurker....you can find me on the IRC (or on DnE and their IRC).

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03-11-2015 06:42 AM
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schoolsux Offline
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What is this I don't even - Algebraic "proof" that 2+2=5

How the fuck???

schoolsux's countdown until school ends:

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03-13-2015 11:37 AM
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Missile Offline
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What is this I don't even - Algebraic "proof" that 2+2=5

Everytime I see one of these old threads with a bunch of posts from inactive users, I imagine myself in a graveyard

Wake up people, and look at life around you
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