Answer
($x^{n}$+7)(3$x^{n}$-5)
Work Step by Step
3$x^{2n}$+16$x^{n}$-35=3$x^{n}$$x^{n}$+16$x^{n}$-35=
3$x^{n}$$x^{n}$-5$x^{n}$+21$x^{n}-35=
$x^{n}$(3$x^{n}$-5)+7(3$x^{n}$-5)=
($x^{n}$+7)(3$x^{n}$-5)
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