Factor 63x^4y-9x^2y^3

$63 x^{4} y - 9 x^{2} y^{3}$

Factor $9 x^{2} y$ out of $63 x^{4} y - 9 x^{2} y^{3}$ .

Factor $9 x^{2} y$ out of $63 x^{4} y$ .

$9 x^{2} y (7 x^{2}) - 9 x^{2} y^{3}$

Factor $9 x^{2} y$ out of $- 9 x^{2} y^{3}$ .

$9 x^{2} y (7 x^{2}) + 9 x^{2} y (- 1 y^{2})$

Factor $9 x^{2} y$ out of $9 x^{2} y (7 x^{2}) + 9 x^{2} y (- 1 y^{2})$ .

$9 x^{2} y (7 x^{2} - 1 y^{2})$

Rewrite $- 1 y^{2}$ as $- y^{2}$ .

$9 x^{2} y (7 x^{2} - y^{2})$