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#1 2007-03-27 02:23:50

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

Need Help

I need to solve

I put all the x on one side and the y on the other and integral

but the result comes out different from the answer'

the answer is


help!


Numbers are the essence of the Universe

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#2 2007-03-27 09:31:48

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Need Help

Hint:

smile

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#3 2007-03-27 17:17:42

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

Re: Need Help

Here what I did, 

no doubt about that.

I use

That will be

, which is different from the answer.


Numbers are the essence of the Universe

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#4 2007-03-27 21:09:03

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Need Help


writing the constant of integration in terms of natural log.

Last edited by JaneFairfax (2007-03-28 01:41:48)

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#5 2007-03-28 02:19:56

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

Re: Need Help

I have a problem with

, plz tell me how to do it , and tell me where I was wrong.


Numbers are the essence of the Universe

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#6 2007-03-28 03:43:04

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Need Help

I wrote:

Hint:

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#7 2007-03-28 09:34:58

Stanley_Marsh
Member
Registered: 2006-12-13
Posts: 345

Re: Need Help

I know , but when I use w=ylny, I will get a different result , I wanna know why?
Check my calculation above

Last edited by Stanley_Marsh (2007-03-28 09:35:41)


Numbers are the essence of the Universe

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#8 2007-03-28 10:26:58

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Need Help

That’s because you can’t eliminate y completely by making the substitution w = ylny.

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