+ Post New Thread
Results 21 to 36 of 36

10th December 2011, 16:17 #21
 Join Date
 Dec 2011
 Posts
 2
 Helped
 0 / 0
 Points
 188
 Level
 2
Re: proof that 2+2 = 5 weird
Full proof without mind cuts :]
(just copied and added few more lines)
Start with: 20 = 20
Which is the same as: 1636 = 2545
Which can also be expressed as: (2+2)^2  9 x (2+2) = 5^2  9 x 5
Add 81/4 to both sides: (2+2)^2  9(2+2) + 81/4 = 5^2  9 x 5 + 81/4
Rearrange the terms: [(2+2) 9/2)]^2 = (59/2)^2
this is because... [(2+2) 9/2)]^2 = [(2+2)  9/2][(2+2)  9/2]= (2+2)^2 + 81/4  9  9 9 9= (2+2)^2  9(2+2) + 81/4
and... (59/2)^2= (5 9/2)(59/2) = 5^2+81/4  45/2  45/2= 5^2+81/4  45 = 5^2+81/4  9x5
Square root the equation: [(2+2)  9/2)]^2 = (59/2)^2 to get (2+2)  9/2 = 5  9/2
Add +9/2 to both sides to get:
2+2= 5

10th December 2011, 16:41 #22
 Join Date
 Mar 2008
 Location
 Greece
 Posts
 11,895
 Helped
 2093 / 2093
 Points
 38,285
 Level
 47
 Blog Entries
 6
Re: proof that 2+2 = 5 weird
SQRT(a²) = a (absolute value of a)
so √[(2+2)(9/2)]² = √[5(9/2)]²
becomes (2+2)(9/2) = 5(9/2)
and not (2+2)  9/2 = 5  9/2
Read post #19 https://www.edaboard.com/thread192478.html#post833679
AlexPlease don't make requests for help in private using PM. Create a thread in the forum so that other members can benefit from the posted answers.
Consider reading this before posting : How To Ask Questions The Smart Way

11th December 2011, 21:41 #23
 Join Date
 Dec 2011
 Posts
 2
 Helped
 0 / 0
 Points
 188
 Level
 2

Advertisement

19th December 2011, 19:07 #24
 Join Date
 Oct 2011
 Posts
 44
 Helped
 6 / 6
 Points
 453
 Level
 4
Re: proof that 2+2 = 5 weird
No. According to order of operation, you must do the math inside the absolute value bracket first.

Advertisement

2nd May 2012, 03:28 #25
 Join Date
 May 2012
 Posts
 1
 Helped
 0 / 0
 Points
 115
 Level
 1
Re: proof that 2+2 = 5 weird
First off, the square root of a number leaves the possibility of it being positive or negative so
(59/2)^2 = (49/2)^2
+ (.5) = + (.5)
Giving you
.5=.5
Or
.5=.5
Or
.5=.5
And
If x = y
Then x  y = 0
And you can't divide by zero so
(x+y)(xy) = y(xy)
Is not
x+y = y

18th August 2012, 10:45 #26
 Join Date
 Aug 2012
 Posts
 15
 Helped
 1 / 1
 Points
 115
 Level
 1
Re: proof that 2+2 = 5 weird
It's so weird title and I am not getting how do you solve this type of problems. I think you should express 3rd line in well matter and why we go through this equation?
inverse trig functions

18th August 2012, 11:18 #27
 Join Date
 Aug 2012
 Location
 Kollam (Quilon), India, India
 Posts
 241
 Helped
 71 / 71
 Points
 3,182
 Level
 13
 Blog Entries
 2
Re: proof that 2+2 = 5 weird
post # 9
x = y
x^2 = xy
x^2y^2 = xyy^2
if you have to apply x^2y^2 = (x+y)(xy) x must not be equal to y. ie. xy will be xero.
same to the post #1
its something called mathematical fallacy love the name.. sounds dreamy ;)
check it out
http://en.wikipedia.org/wiki/Mathematical_fallacyThe occasional visit of success provides just the excitement an engineer needs to face work the following day.
Koichi Tanaka

Advertisement

18th August 2012, 12:07 #28
 Join Date
 Apr 2011
 Location
 Minneapolis, Minnesota, USA
 Posts
 12,951
 Helped
 2580 / 2580
 Points
 52,953
 Level
 56
Re: proof that 2+2 = 5 weird
Here's a formula known as Euler's equation. It's for real and it is paradoxical.
E is the well known important constant which is the base of natural logarithms.
I is the square root of minus 1.
http://betterexplained.com/articles/...ulersformula/

18th August 2012, 12:36 #29
 Join Date
 Jan 2012
 Posts
 4
 Helped
 0 / 0
 Points
 293
 Level
 3
Re: proof that 2+2 = 5 weird
At last moment, taking the square root is the part when above proof gets messy.
On doing so, you have only considered the positive sign.
Actually x^2=4 is x=+2 or 2.
You didn't take the negative part.
Also remember that both the results are not necessary to be true.
Only one may be true.
Here you chose the false one i.e. positive part.
Every mathematics that leads to absurd result arise from some misconception and mistakes.

18th August 2012, 12:52 #30

18th August 2012, 13:47 #31
 Join Date
 Jul 2012
 Location
 chennai,india
 Posts
 1,094
 Helped
 108 / 108
 Points
 5,757
 Level
 18
 Blog Entries
 3

18th August 2012, 21:20 #32
 Join Date
 Apr 2011
 Location
 Minneapolis, Minnesota, USA
 Posts
 12,951
 Helped
 2580 / 2580
 Points
 52,953
 Level
 56
Re: proof that 2+2 = 5 weird
Here's a webpage calling Euler's formula 'a beautiful equation':
http://www.mathscareers.org.uk/viewI...?cit_id=382931
Quote:
"Euler's equation expresses a universal truth, valid in any language or culture. It contains five of the most important numbers in maths: 0, 1, e, i, and π, along with the fundamental concepts of addition, multiplication, and exponentiation. These vital numbers and concepts also crop up in branches of science, engineering, and technology. All these ideas in just a few squiggles  if that's not beautiful, what is?"

18th August 2012, 21:44 #33
 Join Date
 Sep 2010
 Location
 PancevoBelgrade, Serbia
 Posts
 6,427
 Helped
 1736 / 1736
 Points
 33,525
 Level
 44
Re: proof that 2+2 = 5 weird
This Euler's equation bankers apply to peoples loan interest rates plus coefficient of multiplication.

19th August 2012, 03:47 #34

Advertisement

28th December 2012, 23:45 #35
 Join Date
 Dec 2012
 Posts
 1
 Helped
 0 / 0
 Points
 13
 Level
 1
Re: proof that 2+2 = 5 weird
2 +2 = 5
John has 02 bags of sugar of 1.25 kg each.
Maria has 02 bags of sugar of 1.25 kg each.
02 bags + 02bags = 04bags = 05kg
therefore:
02 +02 = 05
The relativity of Einstein in physics shows that the perception of the world depends on the viewpoint of the observer.
In mathematics is also possible to give a different result depending on how conventional applies equation.
02 bags of sugar plus two bags of sugar is equal to five 5kg of sugar.
hugs,
Bogdan

11th January 2013, 01:44 #36
 Join Date
 Jan 2013
 Posts
 1
 Helped
 0 / 0
 Points
 13
 Level
 1
Re: proof that 2+2 = 5 weird
Please dont violate the very basic operations. Division by zero is not defined.
   Updated   
Please dont violate the very basic operations. Division by zero is not defined.
   Updated   
Please dont violate the very basic operations. Division by zero is not defined.
+ Post New Thread
Please login