### Home > APCALC > Chapter 4 > Lesson 4.3.2 > Problem4-125

4-125.

Write and evaluate a Riemann sum to estimate the area under the curve $g\left(x\right) = x · 2^{x+2}$ for $–4 ≤ x ≤ 0$ using $20$ rectangles. Then use your graphing calculator to compute the sum.

Notice that the area will be negative.

$\text{Area}≈ –6.448$
But you will need to show the setup and steps.

Use the eTool below to view the graph.
Click the link at right for the full version of the eTool: Calc 4-125 HW eTool