Factor
\left(x-3\right)\left(x^{2}-7\right)
Evaluate
\left(x-3\right)\left(x^{2}-7\right)
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x^{2}\left(x-3\right)-7\left(x-3\right)
Do the grouping x^{3}-3x^{2}-7x+21=\left(x^{3}-3x^{2}\right)+\left(-7x+21\right), and factor out x^{2} in the first and -7 in the second group.
\left(x-3\right)\left(x^{2}-7\right)
Factor out common term x-3 by using distributive property. Polynomial x^{2}-7 is not factored since it does not have any rational roots.
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