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Originally Posted by 786ARS
my maths teacher showed my how to make 2=1, but i cant remembere how though, lol
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Actually, it's (superficially) quite easy:
Define x=1
If x=1, then x²=1
Thus, x²-1=x-1
Factoring x²-1, you get (x+1)(x-1)
Thus, (x+1)(x-1)=(x-1)
Divide both sides of the equation by (x-1), and you get...
(x+1)=1
Since x=1, that means (1+1)=1, or 2=1.
This is invalid. Why?