Answer
($x^{2}$ + 4 )( 2x + 1 )
Work Step by Step
2$x^{3}$ + $x^{2}$ + 8x + 4 group term
$x^{2}$( 2x + 1 ) + 4 ( 2x + 1 ) factor out GCF from each factor
($x^{2}$ + 4 )( 2x + 1 )
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