Factor 21-7y+3x-xy

$21 - 7 y + 3 x - x y$

Step 1

Factor out the greatest common factor from each group.

Group the first two terms and the last two terms.

$(21 - 7 y) + 3 x - x y$

Factor out the greatest common factor (GCF) from each group.

$7 (3 - y) + x \cdot (3 - 1 y)$

Step 2

Factor the polynomial by factoring out the greatest common factor, $3 - y$ .

$(3 - y) (7 + x)$