Evaluate
x\left(x^{2}+168\right)
Factor
x\left(x^{2}+168\right)
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x^{3}+168x
Combine -28x and 196x to get 168x.
x\left(x^{2}+168\right)
Factor out x. Polynomial x^{2}+168 is not factored since it does not have any rational roots.
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