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simple proof make your mind mad

 
Arun Giridharan
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Start with: -20 = -20
Which is the same as: 16-36 = 25-45
Which can also be expressed as: (2+2) 2 (9 X (2+2) = 52) 9 X 5
Add 81/4 to both sides: (2+2) 2 (9 X (2+2) + 81/4 = 52) 9 X 5 + 81/4
Rearrange the terms: ({2+2}) 9/2) 2 = (5-9/2) 2
Ergo: 2+2 - 9/2 = 5
Hence: 2 + 2 = 5

See... simple, isn't it?

i found this in some mathematical article ,i saved some others tooo
 
pete stein
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Arun Giridharan wrote:Start with: -20 = -20
Which is the same as: 16-36 = 25-45
Which can also be expressed as: (2+2) 2 (9 X (2+2) = 52) 9 X 5
Add 81/4 to both sides: (2+2) 2 (9 X (2+2) + 81/4 = 52) 9 X 5 + 81/4
Rearrange the terms: ({2+2}) 9/2) 2 = (5-9/2) 2
Ergo: 2+2 - 9/2 = 5
Hence: 2 + 2 = 5

See... simple, isn't it?

i found this in some mathematical article ,i saved some others tooo


Your equations as written don't make much sense to me. Could you clarify them a bit?

Usually I've found that similar problems are due to division by 0, but again, I can't follow your math to see if this is the case here.
 
Henry Wong
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I think that you may have copied it wrong, because some of your transitions don't make sense. You are missing operators with some, and you added parens around the equals that compare the both sides.

Henry
 
Peter van de Riet
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-20=-20
16-36=25-45
4^2-36 = 5^2-45
4^2-36 = 5^2-45
4^2-2.4.9/2 = 5^2-2.5.9/2
4^2-2.4.9/2 +(9/2)^2 = 5^2-2.5.9/2 +(9/2)^2
[4-(9/2)]^2 = [5-(9/2)]^2
4-(9/2) = 5-(9/2)
4 = 5
2+2 = 5

I have made a picture for the correct formatting of the quotations above.
Between step 5 and 6 the following is applied a^2 + 2ab + b^2 = (a + b)^2
quotation.jpg
[Thumbnail for quotation.jpg]
Picture of quotation
 
Henry Wong
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This is actually a common trick (although not as common as divide by zero). The trick relies on the fact that the square root has a positive *and* negative result -- and basically obfuscates the fact that they are taking the positive number in one case, and the negative number in the other.

Henry
 
Ryan McGuire
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Henry Wong wrote:
This is actually a common trick (although not as common as divide by zero). The trick relies on the fact that the square root has a positive *and* negative result -- and basically obfuscates the fact that they are taking the positive number in one case, and the negative number in the other.

Henry


I'm curious...
We seem to see a handful of these "proofs" each year. Does anyone here still believe there are simple algebraic ways to prove that two unequal constants are equal?

I'll admit that sometimes it's a fun challenge to determine which one is the invalid step in a new "proof". I'm with Arun... this kind of thing may deserve a or maybe a , but I certainly don't think it deserves a , as some have gotten.

 
Joe Ess
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Joanne Neal
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Joe Ess wrote:


Ryan McGuire wrote:I'll admit that sometimes it's a fun challenge to determine which one is the invalid step in a new "proof".


And the invalid step in that proof is that the quote is 'the love of money is the root of all evil'
 
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