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7\left(x^{4}-1\right)
Factor out 7.
\left(x^{2}-1\right)\left(x^{2}+1\right)
Consider x^{4}-1. Rewrite x^{4}-1 as \left(x^{2}\right)^{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(x-1\right)\left(x+1\right)
Consider x^{2}-1. Rewrite x^{2}-1 as x^{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).
7\left(x-1\right)\left(x+1\right)\left(x^{2}+1\right)
Rewrite the complete factored expression. Polynomial x^{2}+1 is not factored since it does not have any rational roots.