Pages: 1

 

2008-02-26 00:40:21
TrueMusou
Member
+36|6642|United States Of Hamerica
Okay...this is quick and simply, or so it seems.

This is due Wed, so maybe I'd get some replies before then if I post this now....

I need to factor a bunch of polynomials. An example would be:

-2x^2 + 6x - 4 ---> -2(x-1)(x-2)

Some of the ones I need help on are:

1) 4x^2 + x - 2

2) -t^5 + 2t^3 + 2t

3) (x^2)/(x^2 - 1) - (4)/(x + 1) + (4)/(1 - x^2)  <--- Fractions

4) (x^2 - 3x + 1)^2   

5) (2x^2 + 2x - 2) (4x^2 + 4x + 4)

6) (2x^2)/(3 - x) + (9 - x^2)/(3 + x) <--- Fractions

7) 12x^3 + 2x^2 + 2x


Any help will be appreciated...cause these are extra credit problems and the Prof. instructed all the TAs to NOT help us on these...

I know some minds of the BF2s can hammer one or two of these....HELP ME, and thanks yous.
2008-02-26 01:26:04
Gawwad
My way or Haddaway!
+212|7166|Espoo, Finland
You should really do this your self, or atleast try. This is quite important to be able to do later on.
I'll help on a few in a moment, but go through them your self so you understand what happened.

Sorry, forgot about this.
A bit short on time, so here are the first 4, someone check them if they are right, or if you know something you can do to 1 or 4.

1) 4x2 + x - 2
Don't think this can be factored.

2) -t5 + 2t3 + 2t
=   t(-t4 + 2t2 + 2)

3) (x^2)/(x^2 - 1) - (4)/(x + 1) + (4)/(1 - x^2)
=  (x2)/(x2 - 1) - (4x - 4)/(x2 - 1) - (4)/(x2 - 1)
=  x(x - 4)(x2 - 1)-1

4) (x2 - 3x + 1)2
This one looks finished to me aswell.

Last edited by Gawwad (2008-02-26 02:40:57)

2008-02-26 06:30:29
S.Lythberg
Mastermind
+429|6928|Chicago, IL
most of those don't factor well or at all...

have you learned completing the square or polynomial long division?
2008-02-26 12:12:57
TrueMusou
Member
+36|6642|United States Of Hamerica
I actually came up with the same answers as you Gawwad. Many of which look to be unfactorable...or don't factor very well.

Like number 1, I factored out a 4 making it: x^2 + x /4- 1/2. Then I found the roots and called em x1 and x2 (subscripts).
I made it 4(x+x1)(x-x2)
Dunno if that's right....but w/e


I have learned completing the square but I dun believe I know what polynomial long division is...this is a calc class and the prof is giving these x-tra credits cause apparently, the whole 300 bunch of us suck at it.
2008-02-26 12:16:29
liquidat0r
wtf.
+2,223|7108|UK
What do you want help with? If you're asking us to do them for you, then I refuse.

Polynomial long devision is easier than long division with numbers. As long as you have learnt how to do it, that is.

If you don't know how to factorise the examples you've given, then I suggest you look at your text book.
2008-02-26 12:23:19
r'Eeee
That's how I roll, BITCH!
+311|6929

Here is an idea:

Open your book, read an example. Solve the questions you got told to do.

Homework is over.
2008-02-26 12:50:23
argo4
Stand and Deliver
+86|6414|United States
also, do you need to factor them over integers, real numbers or complex numbers?
2008-02-26 12:52:45
TrueMusou
Member
+36|6642|United States Of Hamerica
the book? yea...about that, this prof. made the class buy a book which was around 100 bucks and we never looked in it. Everything comes from lectures and the online posts. So as far as the book goes...it's as good as a door stop.

Believe me, if I could get help elsewhere I would....seeing how I'm posting HOMEWORK on BF2s, it's a desperation move.
2008-02-26 12:55:40
SenorToenails
Veritas et Scientia
+444|6611|North Tonawanda, NY

TrueMusou wrote:

the book? yea...about that, this prof. made the class buy a book which was around 100 bucks and we never looked in it. Everything comes from lectures and the online posts. So as far as the book goes...it's as good as a door stop.

Believe me, if I could get help elsewhere I would....seeing how I'm posting HOMEWORK on BF2s, it's a desperation move.
What book?  Stewart?

 

Pages: 1

Board footer

Privacy Policy - © 2025 Jeff Minard