Quote:
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Originally Posted by Michael Hill
A + A - 2A = A + A - 2A (both members are identical)
A + (A - 2A) = (A + A) - 2A (associative property)
A + (-A) = (2A) - 2A (simplify contents of parentheses)
A - A = 2A - 2A
1(A - A) = 2A - 2A (factoring)
1(A - A) = 2(A - A) (factoring again)
1(A - A)/(A - A) = 2(A - A)/(A - A) (divide both sides by the quantity)
1 = 2
Error...can't divide by 0
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How about 1(A-A)=2(A-A) can automattically be factored out because even if they didn't equal zero which they still are automatically factored out of the equation.
