1) We can start with the coefficients separately, so let's find the GCF of 20,40, and 10. We'll divide all of these numbers by prime numbers. But we can only divide them if we can divide them simultaneously.
So the Greatest Common Factor of those coefficients is 10
2) Examining the variables we can see that the least x term is:
And the least y term is:
3) Therefore we can write out the GCF as:
With the GCF we can rewrite that expression as a product.
And that's the answer