### Home > CALC > Chapter 2 > Lesson 2.2.3 > Problem2-85

2-85.

General form of left-endpoint Riemann Sum:

$\sum_{i=0}^{n-1}\Delta xf(a+\Delta xi)$

n − 1 = 9 n = 10 There are 10 rectangles.

The function is f(x) = 3x² − 2

a = −3 This is where the region starts.

$\Delta x=\frac{1}{2}$

$\text{Each rectangle has a width of }\frac{1}{2}.$

Refer to the graph in part (a).

Use the eTool below to complete the problem.
Click on the link to the right to view the full version of the eTool. Calc 2-85 HW eTool