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x^{2}\left(x-7\right)-4\left(x-7\right)
Do the grouping x^{3}-7x^{2}-4x+28=\left(x^{3}-7x^{2}\right)+\left(-4x+28\right), and factor out x^{2} in the first and -4 in the second group.
\left(x-7\right)\left(x^{2}-4\right)
Factor out common term x-7 by using distributive property.
\left(x-2\right)\left(x+2\right)
Consider x^{2}-4. Rewrite x^{2}-4 as x^{2}-2^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(x-7\right)\left(x-2\right)\left(x+2\right)
Rewrite the complete factored expression.