Author Topic: Integration problem partial fraction!! (Math wiz welcome) (Read 407 times)

boycriedwolf619 · « **on:** October 05, 2007, 06:05:27 PM »

Wondering if any of you guys can be of assistance to me.

I have to integrate 6x/(x^3-8) NOT DERIVATION!
I figured that you have to break down the denominator, so I did so by the difference of cubes formula and got : (x^3-2^3)(x^2+2x+4)
SO no the problem is 6x/(x^3-2^3)(x^2+2x+4)
Then the integration problem is A/(x-2) + Bx+C (x^2-2x-4) After getting the common denominator, I solved for the coefficients and got A=1 , B=-1, C=2

So then the integration problem is dx/(x-2) + (-1x+2)/(x^2+2x+4) dx . The first integration is ln | x-2 |
The second one, I figure splitting it into two integrations.
So, it becomes the integration of -1x/(x^2+2x+4)dx + the integration of 2/(x^2+2x+4). This integration 2/(x^2+2x+4) I got ln | x^2+2x+4 |. Im having problems integrating this part -1x/(x^2+2x+4)dx. Anybody got any clues suggestion or hints much aprreciated!

swangin and bangin · « **Reply #1 on:** October 05, 2007, 08:40:27 PM »

damn doggie
u tryn to be a rocket scientist?

boycriedwolf619 · « **Reply #2 on:** October 05, 2007, 09:12:51 PM »

Quote from: swangin and bangin on October 05, 2007, 08:40:27 PM

damn doggie
u tryn to be a rocket scientist?

LMAO!!! nah I was tryin to do my thing in computer science but not really feeling it any more. Thinking about mathematics but i dunno what I want to do. but i know it would be in the field of math / science / tech

swangin and bangin · « **Reply #3 on:** October 05, 2007, 10:07:52 PM »

you crazy man
i failed algebra one to many times

boycriedwolf619 · « **Reply #4 on:** October 05, 2007, 11:04:33 PM »

Quote from: swangin and bangin on October 05, 2007, 10:07:52 PM

you crazy man
i failed algebra one to many times

LOl well i failed this course calculus 2 first time and retaken it.

swangin and bangin · « **Reply #5 on:** October 05, 2007, 11:11:25 PM »

Quote from: boycriedwolf619 on October 05, 2007, 11:04:33 PM

Quote from: swangin and bangin on October 05, 2007, 10:07:52 PM
you crazy man
i failed algebra one to many times
LOl well i failed this course calculus 2 first time and retaken it.

nah
i failed algebra 2 once, then i failed it twice, then i failed it 3 times and then i failed it for the fourth time
shit is too hard for my genius brain

CoreG37 · « **Reply #6 on:** October 06, 2007, 11:18:29 AM »

Somehow, I think you went too far. It's been awhile since the last time I did integration but the answer should have been simpler than what you came up with