For this case we have the following expression:
![image](https://img.qammunity.org/2019/formulas/mathematics/high-school/nbi0hpmneju02c07t2eql4lvhu9dkp6t0t.png)
We can rewrite the expression by factoring
Rewriting the expression we have:
![image](https://img.qammunity.org/2019/formulas/mathematics/high-school/p12j4dte1oql67n0liby3q77gw3txhcr3v.png)
Then, using the distributive property for the negative sign we have:
![image](https://img.qammunity.org/2019/formulas/mathematics/high-school/n9hqgld1oa5m9x94ttmad1703pt29yggpw.png)
Thus, we have that one of the factors of the given expression is:
12-7x
Answer:
A factor of the given expression is:
12-7x
option 3