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A^{2}\left(A+1\right)-\left(A+1\right)
Do the grouping A^{3}+A^{2}-A-1=\left(A^{3}+A^{2}\right)+\left(-A-1\right), and factor out A^{2} in the first and -1 in the second group.
\left(A+1\right)\left(A^{2}-1\right)
Factor out common term A+1 by using distributive property.
\left(A-1\right)\left(A+1\right)
Consider A^{2}-1. Rewrite A^{2}-1 as A^{2}-1^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(A-1\right)\left(A+1\right)^{2}
Rewrite the complete factored expression.