The professor said for us to try it on our own (as you can see, I did), and if we have problems we can ask some friends.
Im not asking for a correct answer (if mine is wrong), I am only looking for reassurance that this is correct, or a point in the correct direction if it is not. Like I said, I'm only bothering asking about this because of the borderline grade (A/B). With calculus being a 4 credit hour class, the A would be a great help