Posted by **bb** on Wednesday, January 30, 2008 at 7:15pm.

What is the common denominator?

3 2

- + -

1 a-1

-------

4 3

- - -

1 a+1

- algebra -
**Damon**, Wednesday, January 30, 2008 at 7:24pm
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)

- algebra -
**Damon**, Wednesday, January 30, 2008 at 7:48pm
"........but others as well."

Good! That is the whole idea :) You are very welcome.

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