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# This proves my A-Level Maths teacher was wrong!!!!!

8y, 5m agoPosted 8 years, 5 months ago
Proof that 1 = 2

(for those that don't know, the little "^" means to the power of, as in 2^2, 2 squared)

If a=1 and b=1 then...

a^2 - b^2 = 0

and

a^2 - ab = 0

...therefore...

a^2 - ab = a^2 - b^2

...and by factorising...

a(a-b) = (a+b)(a-b)

...and then dividing by (a-b)...

a = a+b

...therefore...

1=2

Done.

AS YOUR MATH TEACHER WOULD SAY FAIL FAIL FAIL
- SpecialK
8y, 5m agoPosted 8 years, 5 months ago
Options

(20)
#1
[SIZE="3"]Oh i see!![/SIZE]

[SIZE="1"]Not![/SIZE]
#2
wrong!
#3
a^2 b^2 = 0

Doesn't that equal 1?

Not sure if this is a joke or supposed to be true???
#4
guerilla;2248109
wrong!

#5
[quote=Benjimoron;2248115]a^2 b^2 = 0

Doesn't that equal 1?[quote]

sorry, i left out some minus signs. :oops:

let me fix it.

Edit: Fixed now, sorry! :oops:
#6
see i told you it was wrong!
#7
guerilla;2248137
see i told you it was wrong!

but it's right now :thumbsup:
#8
you cant divide something by zero though
#9
2nd equation is still wrong:oops:
#10
"...and then dividing by (a-b)..."

WRONG!

You can't divide something by zero, I looked it up!
#11
a = a+b is not 1=2!

its a - a = b
then b=0 which is not 1!

you have to finish solving the equation, not directly substitute it with your assumption that a=1 and b=1
#12
what the.......
#13
:lol:

The fun I used to have trying to prove to people that x/0 = I keep the remainder ;-)
#14
In Equation 3:

[CENTER]a^2 - ab = a^2 - b^2 [/CENTER]

you are proving that 0 = 0.

From that point you can do almost any damn thing!

Looks cool, though.
#15
If a,b=1 then a-b=0 and you can't divide by zero!

#16
Your assumption is flawed. Just because

a^2 - b^2 resolves to zero
and
a^2 - ab resolves to zero

does not mean that

a^2 - b^2 equals a^2 - ab

It's like saying
ab = 0
and
ac = 0
therefore
b = c

No, because a could equal 0
#17
actually,

either a=1 and b=-1 or vice versa

then it works.:whistling:
#18
what you have here is known as the long tail of knowledge. Where someone can state something and as a result of the internet other people with more knowledge correct them.

For example, NASA released some figures regarding a shuttles engine claiming it did this that and the other, and someone one on a blog saw it all and was like WRANG and corrected it all.

brillinat
#19
I didn't understand past the second line!
#20
I don't think in algebra you can designate the 2 variables 'a' and 'b' with the same number!