Keith W. answered 05/22/14
Tutor
New to Wyzant
All Purpose Tutor with specialties in Math & Applied Science
I'm not entirely sure what you are looking for, but you can pull out an (x+4) and end up with (x+4)(b+7)
Or you can multiply through the b and 7 so bx+4b+7x+28
Hopefully that is somewhat helpful, otherwise I will need some clarification