Factor 4-2x-42y+21xy

$4 - 2 x - 42 y + 21 x y$

Step 1

Factor out the greatest common factor from each group.

Group the first two terms and the last two terms.

$(4 - 2 x) - 42 y + 21 x y$

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

$2 (2 - x) - 21 y (2 - x)$

Step 2

Factor the polynomial by factoring out the greatest common factor, $2 - x$ .

$(2 - x) (2 - 21 y)$