Factor
\left(a-b\right)\left(a+b+4\right)
Evaluate
\left(a-b\right)\left(a+b+4\right)
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a^{2}+4a-b^{2}-4b
Consider a^{2}-b^{2}+4a-4b as a polynomial over variable a.
\left(a-b\right)\left(a+b+4\right)
Find one factor of the form a^{k}+m, where a^{k} divides the monomial with the highest power a^{2} and m divides the constant factor -b^{2}-4b. One such factor is a-b. Factor the polynomial by dividing it by this factor.
Examples
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