Polynomials: K(cubed) - 30K- 18 - 4K(squared) by 3+K

BabyBlue

New member
Joined
Jun 1, 2007
Messages
15
I need help with another one: K (cubed)- 0K (squared)- 30K- 18-4K(squared)- 0K by 3+K

I hope I added in the zeros correctly
It was originally: K cubed- 30K-18-4K squared by 3+K
Hope I am not being a bug,
Amy
:?:
 

Mrspi

Senior Member
Joined
Dec 17, 2005
Messages
2,128
Re: Polynomials again

BabyBlue said:
I need help with another one: K (cubed)- 0K (squared)- 30K- 18-4K(squared)- 0K by 3+K

I hope I added in the zeros correctly
It was originally: K cubed- 30K-18-4K squared by 3+K
Hope I am not being a bug,
Amy
:?:
First step is to write the dividend (the expression you're dividing INTO) and the divisor (the expression you're dividing BY) in the same order.

Usually, it is best to write dividend and divisor in "descending order," highest power of the variable to lowest power of the variable.

If we do this, we have

(k<SUP>3</SUP> - 4k<SUP>2</SUP> - 30k - 18) divided by (k + 3)

Ok...now, the long division process is similar to what you learned in grade school. Here's a website which "walks you through" the process. http://www.purplemath.com/modules/polydiv2.htm

Study the website, and see what you can do with your problem. If you still have trouble, please repost showing all of the work you have done.
 

BabyBlue

New member
Joined
Jun 1, 2007
Messages
15
Thanks for replying so fast, I guess I forgot to read the thing about letting the people see your work, so they won't think your just trying to get them to solve the problem for them. Believe me, I have been reading up on this, I read all the things on Purple math, and finally (the most helpful for me) I read the intermediate algebra website.

Now, about the problem I am having. You said you should arrange it in the order of the divisor. So, the long division problem: (Kcubed-30K-18-4Ksquared) divided by (3+K)

So I would need to do this:
(0K-Ok sqaured- K cubed- 30K- 18- 4K squared)?

I just need a little help on the set up.

Thanks,
Amy :)
 

galactus

Super Moderator
Staff member
Joined
Sep 28, 2005
Messages
7,216
Set it up like so:

Here's a start:

Code:
    k^2
  ------------------------------
k+3|k^3 - 4k^2 - 30k - 18
    k^3 + 3k^2
      ----------------------------
         7k^2  -30k   -18

Now, finish up?.
 

skeeter

Senior Member
Joined
Dec 15, 2005
Messages
2,396
correct the typo (should be negative 7k^2) in the last line ...

Code:
    k^2
  ------------------------------
k+3|k^3 - 4k^2 - 30k - 18
    k^3 + 3k^2
      ----------------------------
         -7k^2  -30k   -18
 

BabyBlue

New member
Joined
Jun 1, 2007
Messages
15
Thanks, I got the right answer I think
It is: K squared-7K-9
fraction positive 9 over 3+K
I guess I was just confused.
:p
From now on I know adding zeros is not always the answer.

If someone else ever needs help with dividing polynomials they should go to:
http://www.wtamu.edu/academic/anns/mps/ ... 35_div.htm
Thanks,
Amy
 

Denis

Senior Member
Joined
Feb 17, 2004
Messages
1,639
Amy, start posting k squared this way: k^2
or k cubed: k^3 ...and so on

And square root of k: sqrt(k)
 

BabyBlue

New member
Joined
Jun 1, 2007
Messages
15
Ok. Sorry :wink:
 
Top