Factor
\left(x+1\right)\left(3x^{2}-1\right)
Evaluate
\left(x+1\right)\left(3x^{2}-1\right)
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3x^{2}\left(x+1\right)-\left(x+1\right)
Do the grouping 3x^{3}+3x^{2}-x-1=\left(3x^{3}+3x^{2}\right)+\left(-x-1\right), and factor out 3x^{2} in the first and -1 in the second group.
\left(x+1\right)\left(3x^{2}-1\right)
Factor out common term x+1 by using distributive property. Polynomial 3x^{2}-1 is not factored since it does not have any rational roots.
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