Factor
\left(x-4y\right)\left(7x+9\right)
Evaluate
\left(x-4y\right)\left(7x+9\right)
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7x\left(x-4y\right)+9\left(x-4y\right)
Do the grouping 7x^{2}-28xy+9x-36y=\left(7x^{2}-28xy\right)+\left(9x-36y\right), and factor out 7x in the first and 9 in the second group.
\left(x-4y\right)\left(7x+9\right)
Factor out common term x-4y by using distributive property.
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