I go over combining functions through addition, subtraction, multiplication, and division. I also explain the restriction on domain of these combined functions. Please Note: At the end of my last example I accidentally multiplied by 1/x. I should have multiplied by x/1 as I explained and got 3x+1 as an answer. At minute 6:04 x cannot equal -1 Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage www.YouTube.com/Profrobbob