Math Is Fun Forum

Gotovina

Member

Registered: 2008-02-16

Posts: 8

Double Integration problem

I am having some troubles with double integration. Mainly with integrating with respect to x and y. This is a problem I have.

where D is a rectangular region described by 0<x<ln(9) and 16<y<32. Are there are tricks that will make integrating easier with more than 1 variable?

Last edited by Gotovina (2008-02-19 10:11:29)

Ricky

Moderator

Registered: 2005-12-04

Posts: 3,791

Re: Double Integration problem

It really isn't more than one variable though.  Integrate with respect to x (treating y as a constant), then integrate with respect to y (if x is in there at this point, you messed up).

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"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."

Gotovina

Member

Registered: 2008-02-16

Posts: 8

Re: Double Integration problem

I understand I need to treat Y as a constant if I integrate with respect to X but I am still confused on how to do it. Should I pretend Y is a random number if I integrate w.r.t X?

Gotovina

Member

Registered: 2008-02-16

Posts: 8

Re: Double Integration problem

Anyone? I still don't understand what to do.

Gotovina

Member

Registered: 2008-02-16

Posts: 8

Re: Double Integration problem

I am still lost, anyone have any ideas?