factor out the greatest common factor 6ab+9bc
ab+ac=a(b+c)a is common factorfactor6ab=23ab9bc=33bccommon factor is 3*b or 3b3b(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