Posted by PLEASE HELP!! on Wednesday, January 5, 2011 at 9:48pm.
The rule for multplying and dividing both sides of an inequality do not meantion zero. Explain why??

Math  MathMate, Wednesday, January 5, 2011 at 9:55pm
In general, we do not multiply or divide each side of an equality by zero, as it could give erroneous results. So the same applies to inequalities.
For example:
A=B
Multiply by A:
A*A = A*B
Subtract B²:
A²B² = AB  B²
Factor each side:
(A+B)(AB) = B(AB)
Cancel out (AB)
A+B = B
How does the fallacy work: we divided each side by (AB) which is zero!
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