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# partial integration watch

1. 2
int (x)^2 ln (x) dx
1

= x- int 2 dx
= x-2x

= 2
int [-x]
1

= -1? or is it 1? or is my integration wrong?

Thanks for your time.
2. Is this what you are trying to integrate:

between x=2 and x=1 ?
3. You seem to have started by differentiating instead of integrating. Remember
4. Latex is your friend
5. (Original post by TheNack)
Is this what you are trying to integrate:

between x=2 and x=1 ?
Yup it is. I just realised I didn't know how to integrate ln..I guess I got it confused and differentiated it instead. Thanks. And I really don't get that latex comment-what a waste of time and space.
6. (x^3Lnx)/3 - (x^3)/9
7. (Original post by calamityx)
Yup it is. I just realised I didn't know how to integrate ln..I guess I got it confused and differentiated it instead. Thanks. And I really don't get that latex comment-what a waste of time and space.
If you don't know how to integrate ln(x) then you can choose to differentiate it instead. Let:

and

and then refer to Pork and Beans' post.

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