Answer
($x^{2}$+5)(5$x^{2}$-3)
Work Step by Step
5$x^{4}$-3$x^{2}$+25$x^{2}$-15=$x^{2}$(5$x^{2}$-3)+5(5$x^{2}$-3)=
($x^{2}$+5)(5$x^{2}$-3)
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