THIS! I cannot stress it enough, how much this video has helped me understand the Substitution rule and come to grips with integrals in general. I love you
On the brink of failing the exam I stopped trying to guess and check and put all of my energy into understanding it and I finally understood it reverse chain technique (rct)
Great video eddie, watching right now as part of my preparations for HSC Trial exams. Wish me luck I know you will of even if u don't see this comment. Watched many of your videos liked and subscribed but just wondering could you maybe put in the description if each video were for year 11 or year 12 and whether it is advanced standard or 3u or 4u. Thanks and again I appreciate it mate. From TJHS
You can treat du/dx as a fraction in certain instances, these instances have been proven to be true, but remember IT IS NOT A FRACTION. It just behaves like one sometimes that's all!
when he starts talking about "u boundaries not x boundaries" for the definite integral limits, why does "x=1 so u=2" and "x=2 so u=5"? Where do the 2 and 5 come from?
got it, its because he runs the x limit values through what 'u' equals (x^2 plus one) i.e (1^2 +1 = 2) and (2 ^2 +1 = 5). Just in case any one else asks the same question
