Factoring GCF

ab^2+20ab

From this you can factor 2ab so you get

ab (b + 10)

ab (ab + 20)

Step-by-step explanation:

Because we see both terms have at least one ab in it, we can factor out ab and get ab (ab + 20). However, because ab^2 does not have any coefficient, there is nothing more to factor out. Thus, ab is your greatest common factor, or GCF.