aÂ²=ab square both sides
2aÂ²=aÂ²+ab add aÂ² to both sides
2aÂ²-2ab=aÂ²-ab subtract 2ab from both sides
2a=a cancel out (a-b)
2=1 cancel out a
is two equal to one?
Answer: the flaw with this is that a-b is equal to zero which means that one cannot "cancel out" (a-b)