Math Is Fun Forum

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

multiplication of polynomials by a trinomial

Can somebody help me with this problem? I dont have any idea how to answer it.....
Divide (4x^3yz^3+3x^4y^2z+4x^2y^2z^3+3x^3y^3z-4x^2yz^4-3x^3y^2z^2) by (x+y-z)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: multiplication of polynomials by a trinomial

Hi;

Are you supposed to do it by hand?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

Yes. And i need to show a solution for it..

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: multiplication of polynomials by a trinomial

There is the solution up there in post #2.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

phanthanhtom

Member

Registered: 2012-06-22

Posts: 290

Re: multiplication of polynomials by a trinomial

Prove that by cross multiplication. Multiply right hand side in Bobbym's equation with your trinomial. That's it.

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

Im sorry I cant understand it T_T i dont know where to start. :"(

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

Please help me

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: multiplication of polynomials by a trinomial

With the multiplication?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

Thank you i already understood it!!!!!! Your a great help thank you so much

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

Just another thing, im still having a hard time understanding how you come up with the answer. Can you please explain it? Just one last favor pls.

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

Pleaseeee,..........m

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: multiplication of polynomials by a trinomial

I used a computer! But if you show me what method you are supposed to use I will assist with the steps?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

jafrevelar

Member

Registered: 2013-06-15

Posts: 8

Re: multiplication of polynomials by a trinomial

I tried to used long division

phanthanhtom

Member

Registered: 2012-06-22

Posts: 290

Re: multiplication of polynomials by a trinomial

Polynomial division techniques can be found on the main website. Type 'polynomial division' into the search box.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,645

Re: multiplication of polynomials by a trinomial

hi jafrevelar

Welcome to the forum.

In the screen shot below I have shown my layout for this.  (note: it will be beneficial to keep terms in neat columns)

(i) I re-ordered the terms to start with the highest power of x, and then in descending powers.  Make sure the signs go with the terms.

(ii) Ask what must I multiply by x to get

(iii) now multiply (x + y - z) by this amount and put the results below.  Line up matching terms to make the subtraction easier.

(iv) Subtract and write in the remaining terms.

(v) Ask what must I multiply by x to get

(vi) Subtract to get the remainder.  This is zero so the division is complete.

Hope that helps, 

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob