We know how to do r^5(5r^4+r^3) but not when there are two letters involved like r^5s(5r^4s^2 + r^3s^5).  any help would be appreciated.  Thanks.
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1 Answer

r5s(5r4s2+r3s5)=

5r9s3+r8s6.

This can be factorised: r8s3(5r+s3).

by Top Rated User (1.2m points)

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