# Math Help - Left End Points

1. ## Left End Points

I cant seem to get this problem:
Calculate for over .
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!

2. Originally Posted by Casas4
I cant seem to get this problem:
Calculate for over .
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"...

Tonio

3. 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.

4. ## Riemann Sums

Yes using Riemann Sums Im so sorry.