Verified Answer :

ab+ac=a(b+c)
a is common factor
factor

6ab=23ab
9bc=3
3bc
common factor is 3*b or 3b

3b(2a)+3b(3c)=3b(2a+3c)

3b(2a + 3c)       Both 6 and 9 are divisible by three and the b is in both parts of                             expression