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Q&A #267


An algebraic "proof" that 2 = 1

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From: Claudia (for Teacher2Teacher Service)
Date: May 13, 1998 at 22:25:07
Subject: Re: Algebra proof

Sorry it has taken me so long to reply, but I couldn't locate the proof you wanted until today! Start off with a = b then multiply by a a^2 = ab subtract b^2 a^2 - b^2 = ab - b^2 factor (a+b)(a-b) = b(a-b) divide (a-b) a + b = b substitute b + b = b simplify 2b = b divide by b 2 = 1 Of course there are errors in the process that allow for division by zero (a- b) since a = b.

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