Factor
\left(a+1\right)\left(3b+1\right)
Evaluate
\left(a+1\right)\left(3b+1\right)
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3b+1+a\left(3b+1\right)
Do the grouping 1+3b+3ab+a=\left(1+3b\right)+\left(3ab+a\right), and factor out a in 3ab+a.
\left(3b+1\right)\left(1+a\right)
Factor out common term 3b+1 by using distributive property.
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