Help!! Im a little stuck.. I need to decompose this into partial fractions:

- anonymous

Help!! Im a little stuck.. I need to decompose this into partial fractions:

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- anonymous

\[(2x^2-11x+5)/(x-3)(x^2+x-4)\]

- Hero

What course are you currently taking?

- anonymous

This is Pre-Calc Hero

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- Hero

Okay, just wondering.

- anonymous

Then I use A/(x-3)+B(x^2+x-4)

- Hero

What textbook are you using for the course?

- anonymous

Precalculus: Graphs and Models by Addison Wesley

- Hero

Thanks

- anonymous

Its pretty old. 1997

- Hero

That's okay. Sometimes, old is better.

- anonymous

Okay. I mean its probably all the same techniques, for the most part.

- Hero

What edition?

- Hero

Well, nevermind. I'll get get the latest edition.

- anonymous

Ok I wasnt sure. I dont know if it says it for sure.

- Hero

If you have the book, it will say what edition it is. You just have to look, but okay.

- Hero

I have about 9 min left before it finishes downloading

- anonymous

I really dont see it at all :O This is the exact book though http://www.abebooks.com/book-search/isbn/0201694425/hard-cover/

- anonymous

Ok thats fine. Thanks

- Hero

If you want to show someone a book, use amazon.com

- anonymous

ahh alright.

- Hero

Yes, that version is very old. It's not even available for download. It's the first edition apparently

- Hero

4 minutes left..

- anonymous

ok

- Hero

If you have the book, is there any reason why you are not able to understand this concept?

- anonymous

I get the concepts down sort of, I just end up with the wrong numbers. I either do a step too early or Im not doing it completely right. I just want to make sure I understand it

- Hero

Okay, I will have a look here in about 15 secs

- anonymous

Ok Ill go through with what Im doing and you can maybe see what Im doing wrong

- anonymous

Let me know when its done

- Hero

It might take me a bit to figure this out.

- anonymous

Ok thats fine!

- Hero

Okay, I see something similar to this where it talks about setting up a decomposition template.

- anonymous

Its in a lesson called Partial Fractions in my book

- anonymous

That sounds right though

- Hero

\[\frac{2x^2 - 11x+5}{(x-3)(x^2+x-4)} = \frac{A}{x-3} + \frac{Bx + C}{x^2 + x -4}\]

- Hero

Maybe that's what you're looking for.

- anonymous

So then its \[A(x^2+x-4)+(x-3)(Bx+C)=2x^2-11x+5\]

- Hero

What I posted is in your book so it is correct. If what you posted is the next step, then by all means, go right ahead, but maybe someone else can take a look at that for you.

- anonymous

Ok thats cool. I needed that for sure so thanks a lot Hero

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