Factor
\left(9a-1\right)\left(a+b\right)
Evaluate
\left(9a-1\right)\left(a+b\right)
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a\left(9a-1\right)+b\left(9a-1\right)
Do the grouping 9a^{2}-a-b+9ab=\left(9a^{2}-a\right)+\left(-b+9ab\right), and factor out a in the first and b in the second group.
\left(9a-1\right)\left(a+b\right)
Factor out common term 9a-1 by using distributive property.
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