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## Homework Statement

Compute the integral that is highlighted in MyWork.jpg using Riemann sums using left and right endpoints.

## Homework Equations

##x_i* = a + i Δx##

##*x_i = a + i Δx - Δx##

##Σ_{i=1}^{n} i = n(n+1)/2##

##Σ_{i=1}^{n} i^2 = n(n+1)(2n+1)/6##

## The Attempt at a Solution

My attempt is attached as MyWork.jpg. I've done this problem several times and, I cannot figure out what I am doing wrong. I would really appreciate it if someone could point out what I am doing wrong!

#### Attachments

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