Algebra: A Combined Approach (4th Edition)

$x^{2}(x+5)$
$x^{3}+5x^{2}$ Take out common factor $x^{2}$, which is the GCF of $x^{3}$ and $5x^{2}$: $x^{3}+5x^{2}=x^{2}(x+5)$