Factor
\left(a+1\right)\left(8b+1\right)
Evaluate
\left(a+1\right)\left(8b+1\right)
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a+1+8b\left(a+1\right)
Do the grouping 1+a+8ab+8b=\left(1+a\right)+\left(8ab+8b\right), and factor out 8b in 8ab+8b.
\left(a+1\right)\left(1+8b\right)
Factor out common term a+1 by using distributive property.
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