posted by bb on .
What is the common denominator?
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If your denominator on the top is (a-1) and your denominator on the bottom is (a+1) then your common denominator is (a-1)(a+1) which by the way is (a^2-1)
Thank you very much. It helped me not only on that problem but others as well. :)
"........but others as well."
Good! That is the whole idea :) You are very welcome.