Question 218690
This is just the distributive property followed by combining like terms.


6r + 2(r+4)
6r + 2r + 8


Now combine like terms:
8r + 8



For additional explanation on this topic, please go to my website.  Do a "Bing" search for my last name "Rapalje".  Look for "Rapalje Homepage" at the top of this search.  Look near the top of my Homepage for "Basic, Intermediate and College Algebra: One Step at a Time".  Click on "Basic Algebra" and look in Chapter 1 for the sections called "Distributive Property and Combining Like Terms".  


R^2


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus