Answer
( $x^{2}$ + 3 ) ( x + 4 )
Work Step by Step
$x^{3}$+ 4 $x^{2}$ + 3x + 12 group term
$x^{2}$ ( x + 4 )+ 3 ( x + 4 ) factor out GCF from each grouping
( $x^{2}$ + 3 ) ( x + 4 )
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