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December 17th, 2011, 07:54 PM   #1
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series question - might be an algebra question



In the last step where the limit is present. The step showing the result of dividing everything by . Does anyone know why they didn't divide the 2 in the denominator by ?
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December 17th, 2011, 08:05 PM   #2
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Re: series question - might be an algebra question

Yes, the denominator consists of two factors. Consider two factors a and b:



Now, if we divide these factors by a quantity x, we may write:



We would not write:

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December 17th, 2011, 08:28 PM   #3
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Re: series question - might be an algebra question

ok, thank you. I see.
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