Factor
\left(4s-1\right)\left(2r+1\right)
Evaluate
\left(4s-1\right)\left(2r+1\right)
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2r\left(4s-1\right)+4s-1
Do the grouping 8rs-2r+4s-1=\left(8rs-2r\right)+\left(4s-1\right), and factor out 2r in 8rs-2r.
\left(4s-1\right)\left(2r+1\right)
Factor out common term 4s-1 by using distributive property.
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