# Something bugging me in Calc, help me if you want...

Discussion in 'Community Discussion' started by Dabisu, Oct 31, 2007.

1. ### Dabisu macrumors member

Joined:
Jun 8, 2006
#1
Ok, I have this calculus question and I've been obsessing over it. I won't be able to contact my teacher until this Friday, and it has been bugging the hell out of me as I go over and over my notes trying to figure this out.

So if you think you might be able to help, then please try!

My professor mentioned something in class, and I asked him about it, but I realized I ended up asking about something else instead. So I'm stuck trying to figure this out.

We just moved into finding the area underneath a graph. We had this problem where we were given something in Riemann sum and we had to determine the region of the graph. I found the answer easily assuming it was using right end points only. So maybe I misunderstood him or didn't catch something. Thanks!

What I don't get is how he was able to determine that it was in fact using right end points.

I have a picture of the notes I took. I understand that as you increase n to infinite, the sample point x1* becomes a. There is a leap from that step to where he was able to plug in 1 and n, which are the beginning and end points of a right end point function. I don't see how realizing x1* becomes a helps me in determining right end points, in fact, it makes me think it's a left end point because a = x0.

2. ### Shaun.P macrumors 68000

Joined:
Jul 14, 2003
Location:
Omicron Persei 8
#2
I'm in my second year of a maths degree and have never saw a question like this.

What level of maths is this?