Factor
4\left(a-b\right)\left(2ab+1\right)
Evaluate
4\left(a-b\right)\left(2ab+1\right)
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4\left(2a^{2}b-2ab^{2}+a-b\right)
Factor out 4.
2ab\left(a-b\right)+a-b
Consider 2a^{2}b-2ab^{2}+a-b. Do the grouping 2a^{2}b-2ab^{2}+a-b=\left(2a^{2}b-2ab^{2}\right)+\left(a-b\right), and factor out 2ab in 2a^{2}b-2ab^{2}.
\left(a-b\right)\left(2ab+1\right)
Factor out common term a-b by using distributive property.
4\left(a-b\right)\left(2ab+1\right)
Rewrite the complete factored expression.
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