For this case we must factor the following polynomial:
![wz-18 + 6z-3w](https://img.qammunity.org/2020/formulas/mathematics/middle-school/cy4v22mlg5j7cplzpnmwk034idvxcy3x7u.png)
We have two variables, so, the factorization will be of the form:
![(w \pm\ ) (z \pm \ )](https://img.qammunity.org/2020/formulas/mathematics/middle-school/1tawu6op4pn8gn5znq1xf9u30u1p0uvnsq.png)
We must find two numbers that when multiplied result in the independent term, that is, -18.
We have to:
![+ 6 * -3 = -18](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hg3u7ix4xihy0vpjzxd7iq382gq716jbpa.png)
+6 and -3 are used because they are the coefficients that accompany the polynomial variables. So, we have:
![(w + 6) (z-3)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/lxv2ylnl3t9w9a54bvrj8827uasbhfiwik.png)
Answer:
![(w + 6) (z-3)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/lxv2ylnl3t9w9a54bvrj8827uasbhfiwik.png)