- Thread starter
- Admin
- #1

I have posted a link there to this thread so the OP can see my work.How do I find the nth sum of these functions (calculus I)?

My professor explained it very poorly and I have no idea how to solve these.

If possible, could you walk me through it and give me a good way to think about these to solve them properly? It's greatly appreciated, my exam is next week.

1) Sum of i=1 to n of (4-9i)

2) Sum of i=1 to n of (i+1)(i+4)

3) Sum of i=1 to n of (i^3 - i - 2)

4) Sum of i=1 to n of 3/n(i/n)^2

I don't need all of them done, I just need someone to explain how to do these. I'm so confused. I really appreciate your help!