Answer:
![5(56z - 5y - 6)](https://img.qammunity.org/2021/formulas/mathematics/high-school/1s0q2g49rjjc82t271olw7p4dd3e0hcgub.png)
Explanation:
Forst step is finding a common factor, you can do this easily by looking at the ones digit. All 3 values end in 0 or 5, so a factor is definately 5.
We now divide all values by 5.
![280z / 5 = 56z \\ (- 25y) / 5 = ( - 5y) \\ ( - 30) / 5 = ( - 6)](https://img.qammunity.org/2021/formulas/mathematics/high-school/zscuf1iopynap6y1w1mc2izbn4ty6tkpne.png)
Once you get a prime number after factoring, that is the GCF, Greatest Common Factor. We can make an equation like what is below to show oir factored answer.
![5(56z - 5y - 6)](https://img.qammunity.org/2021/formulas/mathematics/high-school/1s0q2g49rjjc82t271olw7p4dd3e0hcgub.png)