## Algebra 1

$7x; 9x^{2} - 4$
$63x^{3} - 28x$ We see that that two terms have a 7x common so we can factor it out of the two terms $7x(9x^{2} - 4)$ Since the Area of a square is length x length, the length could be either 7x or $9x^{2} - 4$