### Find the greatest common factor

Find the greatest common factor and factor by grouping (see attached) 1. Find the greatest common factor (GCF) of 18x and 15x 2. Find the greatest common factor (GCF) of 28 a b and 44 ab 3. Factor. Check by multiplying 4x + 36x= 4. Factor. Check by multiplying = 5. Factor. = 6. Factor by grouping. = 7. Fa