How do you find the greatest common factor of #105x, 30yx, 75x#?
Remember that the greatest common factor (GCF) is the largest factor that each number has in common.
First, you split each one up into simplest form.
Then you pick the common factor(s) from each one. Basically, what does each one have in common. We see that each one has a 3 and a 5. Thus the GCF is