## College Algebra (6th Edition)

$x^{2}$ - 12$x$ + 36 - 49$y^{2}$ = ($x^{2}$ - 12$x$ + 36) - 49$y^{2}$ = ($x$ - 6)$^{2}$ - 49$y^{2}$ = ($x$ - 6)$^{2}$ - (7$y)^{2}$ = ($x$ - 6 + 7$y$)($x$ - 7$y$ - 6) = ($x$ + 7$y$ - 6)($x$ - 7$y$ - 6)