Answer
$x^{2n}(x^{2n}+x+1)$
Work Step by Step
$x^{4n}+x^{2n}+x^{3n}=\\=x^{2n}\cdot x^{2n}+x^{2n}\cdot1+x^{2n}\cdot x\\=x^{2n}(x^{2n}+x+1)$
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