## Introductory Algebra for College Students (7th Edition)

$3x^{2}y(4x-1)(4x+1)$
$48x^{4}y-3x^{2}y\qquad$... factor out the common term, $3x^{2}y$ $=3x^{2}y(16x^{2}-1)\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$ $=3x^{2}y(4x-1)(4x+1)$