2=1 Math Puzzle

Wednesday, May 6, 2009

Proof that 2=1:

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

Why is this argument false?

Solution (Highlight): In step 5 you can not divide by zero.