The greatest common factor of 4ab and 6ab is 2ab. You simply take the greatest common factor from both factors. The greatest common factor of 4 and 6 is 2. The letters can be factored out because they appear in both factors
2ab
Since 3a is a factor of 6ab, it is automatically the GCF.
6ab
6b
The GCF is 6ab
4ab - 6ab = ab(4 - 6). ab(4 - 6) = 2ab(2-3)
6ab
3a
4ab - 2a - 7
Assuming that non-leading numbers are exponents, the expression becomes12a^2b + 8a - 5a^2b + 2ab - 4ab^2 + 6ab - 2a - 3ab= 7a^2b + 6a + 5ab - 4ab^2= a*(7ab + 6 + 5b - 4b^2)
-2
30
2a x 3b = 6ab