"proof" that 2 = 1: I can't find the error...?

d123e4

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Joined
Sep 11, 2008
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2
Hi guys, I saw this on the web. I haven't done any math in a while and I can't seem to find where the error is, but I'm sure there is one. I'm sure I must of forgotten some simple algebra rule but I can't stop thinking about this problem.

a = b
a^2 = ab
a^2 - b^2 = ab – b^2
(a + b)(a – b) = b(a – b)
(a + b) = b
a + a = a
2a = a
2 = 1
 
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