Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

maths help!

  • 29-04-2010 2:33am
    #1
    kelxx
    Registered Users, Registered Users 2 Posts: 20 ✭


    anybody know how to integrate x^3(lnx)^2 dx by integration by parts????


Comments

  • #2
    Clinker
    Registered Users, Registered Users 2 Posts: 271 ✭✭Clinker


    Any term involving ln(x) is usually u in integration by parts. You'll need to use parts again on the result.


  • #3
    LeixlipRed
    Closed Accounts Posts: 6,081 ✭✭✭LeixlipRed


    Generally, though it's not always the case, you let dv equal to whatever is easiest to integrate. Here, x^3 is much easier to integrate than (logx)^2.


  • #4
    kelxx
    Registered Users, Registered Users 2 Posts: 20 ✭kelxx


    can anybody do this step by step...im lost :(


  • #5
    MathsManiac
    Registered Users, Registered Users 2 Posts: 1,595 ✭✭✭MathsManiac


    As suggested above, let u = (ln(x))^2 and let dv = x^3 dx.

    Proceed from there. If you get stuck, post again, telling us how far you got.


  • #6
    kelxx
    Registered Users, Registered Users 2 Posts: 20 ✭kelxx


    worked it out!! thanks:D


  • Advertisement
Advertisement