Introductory Algebra for College Students (7th Edition)

$5x^{2}(2x^{2}+4x+3)$
$10x^{4}+20x^{3}+15x^{2}\qquad$...factor out the common term, $5x^{2}$ $=5x^{2}(2x^{2}+4x+3)$