2+2=5

So being a nerd right now i thought i'd like to humor you folks with a math joke i learned last quarter. ready to get your minds blown? :]

okay firstly we all can agree that 2+2=2+2+0 right?

now we'll let x be any non-zero number and set x=y
So:
x=y
x^2=xy is correct
x^2-y^2=xy-y^2 is also correct
now we're gonna factor
(x+y)(x-y)=y(x-y)
so now the (x-y) on both sides will cancel out resulting in
x+y=y
can also be expressed as:
2y=y
2=1
1=0

now remember 2+2=2+2+0 right? now lets apply the proof 1=0
2+2+0=2+2+1=5

Thus 2+2=5 :]

can you figure out what is wrong in this problem?
(bonus points to whoever can name the originator of this "proof")

first person to figure it out gets this plate of cookies

Those cookies look good but math is not my strong suit.

x-y = 0

So when you're canceling the (x-y) on both sides you're dividing by zero which is a big no no.

*noms the cookies*

Well sure, unless the other couple has a baby too. Then it would be 2 + 2 = 6.


(hmm)

limlim wins :]
enjoy your cookies ^_^

Oh my, never been good at math ! Now I'll believe 2+2=5 for all eternity WHAT HAVE YOU DONE!

wow hats off to limlim

In didital logic sytems 1+1 = 0 a/k/a Binary Code
Figure that one out. There are 7 logice families.
And the Hexadecimal Code is the Bar Code use on most all products.
I'll quit swearing now

I'm not a Nerd, I'm a geek. Our jokes are a little different, such as: Schrödinger's cat walks into a bar... and doesn't.