Factor
\left(4-n\right)\left(r+s\right)
Evaluate
\left(4-n\right)\left(r+s\right)
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r\left(-n+4\right)+s\left(-n+4\right)
Do the grouping 4r-rn+4s-sn=\left(4r-rn\right)+\left(4s-sn\right), and factor out r in the first and s in the second group.
\left(-n+4\right)\left(r+s\right)
Factor out common term -n+4 by using distributive property.
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