# Left End Points

• May 23rd 2010, 08:06 PM
Casas4
Left End Points
I cant seem to get this problem:
Calculate http://webwork.math.uwyo.edu/webwork...47d3498f61.png for http://webwork.math.uwyo.edu/webwork...d946c29ea1.png over http://webwork.math.uwyo.edu/webwork...9e55fb8c71.png.
for my delta x I got 3pi/16, then I tried to get my height points which I got to be (3pi/4, 15pi/16, 9pi/8, 21pi/ 16). Then I plugged each point into f(x) added them together and then multiplied by delta x. But its still not right can someone help me figure out what Im doing wrong?
Thanks!
• May 24th 2010, 03:06 AM
tonio
Quote:

Originally Posted by Casas4
I cant seem to get this problem:
Calculate http://webwork.math.uwyo.edu/webwork...47d3498f61.png for http://webwork.math.uwyo.edu/webwork...d946c29ea1.png over http://webwork.math.uwyo.edu/webwork...9e55fb8c71.png.
for my delta x I got 3pi/16, then I tried to get my height points which I got to be (3pi/4, 15pi/16, 9pi/8, 21pi/ 16). Then I plugged each point into f(x) added them together and then multiplied by delta x. But its still not right can someone help me figure out what Im doing wrong?
Thanks!

The first and biggest mistake you're doing is not defining for us whadda heck do you mean by $L_4$ , "height points|(??), "delta x"... (Headbang)

Tonio
• May 24th 2010, 03:49 AM
HallsofIvy
I could try to guess that you are talking about a Riemann sum using 4 sub-intervals, using the left end point for the function value, but it would be really nice if you would tell us that!

What you say you are doing is correct so any error must be in the execution- show us exactly what you did.
• May 24th 2010, 07:33 AM
Casas4
Riemann Sums
Yes using Riemann Sums Im so sorry. :(