## Algebra 1: Common Core (15th Edition)

$49$
$p=7x,\qquad q=7y,\qquad$x and y have no common factors. $p^{2}=7^{2}x^{2}\qquad q^{2}=7^{2}y^{2}$ x and y have no common factors. So their GCF is $7^{2}=49$.