# Thread: help with riemann sum

1. ## help with riemann sum

use a right-hand sum with 4 equal subintervals to approximate the integral $\int_{-1}^{3}\left|2x-3 \right|dx$

mysteps
- $\Delta x=\frac{4}{4}=1$
- $c1=????$
- I know that i need to get the endpoints for the interval. But i forget how.

All help is appreciated..

2. $f(x) = |2x-3|$

$\Delta x = \frac{b-a}{n} = \frac{3 - (-1)}{4} = 1$

right sum ...

$\int_{-1}^3 f(x) \, dx \approx f(0) + f(1) + f(2) + f(3)$

3. thanks