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Posted by Nick on Sunday, April 11, 2010 at 7:20pm.

I'm trying to factor this and I just can't figure it out. Help? r^4 s^4 - 81

difference of two squares

r^4 s^4 - 81 (r^2s^2 - 9 )(r^2s^2 + 9 ) (rs-3)(rs+3)(r^2s^2+9)

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