Factor
\left(b-4\right)\left(a+6\right)
Evaluate
\left(b-4\right)\left(a+6\right)
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a\left(b-4\right)+6\left(b-4\right)
Do the grouping ab-4a+6b-24=\left(ab-4a\right)+\left(6b-24\right), and factor out a in the first and 6 in the second group.
\left(b-4\right)\left(a+6\right)
Factor out common term b-4 by using distributive property.
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