Hello, I would just like to ask for an explanation of this statement, if it could be step-by-step, I would greatly appreciate it. I tried by very best but I just can't grasp it. The statement is in blue. Might as well, check for my explanations at the other statement if my explanations were correct or not, or somewhat in between. Thank you very much AAC world! EDITED: Peterson, T.S. Calculus with Analytic Geometry. Ken Incorporated, Quezon City.