Teacher2Teacher 
Q&A #4168 
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From: Arthur Minor To: Teacher2Teacher Public Discussion Date: 2001121021:19:27 Subject: Re: Algebra Proof of 2 = 1 Let a = 1 Multiply by a to get a^2 = a Subtract 1 to get a^2  1 = a  1 Factor left side (difference of two squares) to get (a + 1)(a  1) = a1 Divide both sides by a1 to get a + 1 = 1 Sustitute 1 for a to get 1 + 1 = 1 so 2 = 1 The fallacy is we divided a1/a1 = 1, but it is really 0/0 undefined.
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