## Intermediate Algebra for College Students (7th Edition)

$2x(7y-5z+4w)$
The greatest number that divides the numerical coefficients is 2. The variables raised to the smallest exponents are $w^0$ (which is equal to 1), $x$, $y^0$ (which is equal to 1), and $z^0$ (which is equal to 1). Thus, the greatest common factor is $2x$. Factor this out to obtain: $=2x(7y-5z+4w)$