1. ## Difficult Integration problem!!

Hi folks I would greatly appreciate some help with this. I have to integrate the following for a project;

Integrate ; (a-m/2 ). (1.122 - 0.231(a/b) + 10.55(a/b)2 - 21.71(a/b)3 - 30.382(a/b)4)-m da

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I know integration by parts, so can I get away with U =(1.122 - 0.231(a/b) + 10.55(a/b)2 - 21.71(a/b)3 - 30.382(a/b)4)-m
and dV=a-m/2

using integral of UdV = UV - integral(v).dU

I'm unsure if the problem is as simple as that??

2. ## Re: Difficult Integration problem!!

You certainly can do that but I wouldn't call it simple! Have you calculated what $\displaystyle \int VdU$ would be? Is that any simpler?

3. ## Re: Difficult Integration problem!!

I have integrated by parts, and you are right, the answer is more complicated, however I need the answer, because I have limits for a, as I need to plot a graph. You are certain that integration by parts is ok though? When I try wolfram alpha, it doesn't manage to compute an answer, which has made me doubt whether my integration by parts was a valid method to use.

4. ## Re: Difficult Integration problem!!

I think this is probably a function that you have to integrate numerically. It sounds like this might be acceptable to you - you would need to have limits for a and actual numbers for b and m; then you can get a number for the answer. There are many sites that will do this - Wolfram Alpha is one. Of course you can do this multiple times to get a graph, but it's going to take some effort.

- Hollywood

5. ## Re: Difficult Integration problem!!

Thanks for the help, yeah I have numbers and limits for all the letters and will use excel to produce multiple solutions