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as we know, , , and so on....
From this we can conclude that:
If the of any two numbers , then or of the numbers .
In other words, if , then or . We need also to include the possibility that .
This is called and we use it often to solve quadratic equations.
here is one example:
by the null factor law, either or must be equal to .
will be equal to only if will be equal to only if
