Answer
=($x^{2}$+3)($x^{2}$+2)
Work Step by Step
$x^{4}$+5$x^{2}$+6=
=$x^{4}$+2$x^{2}$+3$x^{2}$+6=
=$x^{2}$($x^{2}$+2)+3($x^{2}$+2)=
=($x^{2}$+3)($x^{2}$+2)
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