Ok, so he said I would fail if I could not prove it....

3 months later I came upwith the solution....

Where is the Flaw?

A=B

A^2 = AB

A^2 - B^2 = AB - B^2

(A+B)(A-B) = B(A-B)

A+B = B

2B = B

2=1

What I did each step: (sorry forum not conducive to spaces)

A=B - Given

A^2 = AB - Multiplicative Property of Equality (A)

A^2 - B^2 = AB - B^2 - Additive Property of Equality (-B^2)

(A+B)(A-B) = B(A-B) - Evaluation

A+B = B - Reduction

2B = B - Substitution and Addition (since first statement say a=b)

2=1 - Reduction (by B)

The "^" means to the power of.