Asked by Nick

I'm trying to factor this and I just can't figure it out. Help?

r^4 s^4 - 81
Answered by Damon
difference of two squares
Answered by Damon
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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