Factoring Polynomials

zee-f · 2011-07-20 23:56:31

hey i was wondering if any body can help and see if i did theses correct for #1 i got a for #2- i got a for #3 i got f for number #4 i got d

thanx

1. 4x^3 12x^2 + 4x

A4x(x^2 3x + 1)
B4x(4x^2 3x + 1)
C4x(4x^2 3x - 1)
D4x(x^2 6x + 1)
E2x(2x^2 6x + 2)
FThis polynomial cannot be factored using the GCF method.

2. 9x^4 + 4x^3 27x^2 + 12x

Ax(9x^3 + 4x^2 + 27x - 12)
Bx(9x^3 + 4x^2 27x + 12)
Cx(9x^4 + 4x^3 27x^2 + 12x)
Dx(9x^2 + 4x 27x + 12)
E3x(3x^3 + x^2 9x + 4)
FThis polynomial cannot be factored using the GCF method.

3. x^2 3x + 4

Ax(x 3)
Bx(x + 3)
Cx(x 1)
Dx(x 7)
Ex(x + 7)
FThis polynomial cannot be factored using the GCF method.

4. 17x^5 + 51x^2 34

A17x^5 + 3x^2 + 2
B17(x^3 + 3x^2 + 2)
C17(x^4 + 3x^2 + 2)
D17(x^5 + 3x^2 2)
Ex^5 + 3x^2 2
FThis polynomial cannot be factored using the GCF method.

anonimnystefy · 2011-07-21 00:09:50

hi zee-f

1 is correct!2 is incorrect(hint:look at the signs).3 and 4 are also correct.

zee-f · 2011-07-21 00:48:44

for 2 i missed the signs lol thats a tricky one for #2 its B

zee-f · 2011-07-21 00:50:45

does anybody know a good website that teaches you Factoring Polynomials using grouping

bobbym · 2011-07-21 00:56:10

Hi zee-f;

I can not think of a better one than here. You can learn by doing. Post them and show your work. Someone will help.

zee-f · 2011-07-21 02:02:39

how can i factor by grouping if theirs only three terms

bobbym · 2011-07-21 02:07:00

What does the problem look like?

zee-f · 2011-07-21 02:26:08

x^2 2x + 1

bobbym · 2011-07-21 02:30:49

That one is not done by grouping which is usually for degree 3 or more polynomials.

zee-f · 2011-07-21 02:35:23

A(x 1)(x 1)
B(x 1)(x + 1)
C(x + 1)(x 1)
D(x + 1)(x + 1)
E(x + 2)(x 1)
FThis polynomial cannot be factored by grouping.

bobbym · 2011-07-21 02:37:29

Hi;

A is correct, what did you get?

zee-f · 2011-07-21 02:40:08

so why is it a like a want an explanation on how to do these polynomials in grouping

bobbym · 2011-07-21 02:40:52

I use factoring to do those, have you been taught that?

zee-f · 2011-07-21 02:46:26

i was taught by finding the GCF now i have to do them by grouping am confused on the grouping method

bobbym · 2011-07-21 02:50:28

Hi;

The GCF is used on bigger ones ( 4 terms ). Do you remember how to do one by grouping as you call it?

See you a little later, have to rest for a while.

zee-f · 2011-07-21 03:10:00

see its not letting me choose witch method the question says Factor problems 5 - 8 by grouping.

6. x^2 + 2x 15

A(x - 5)(x 3)
B(x + 5)(x + 3)
C(x + 5)(x 3)
D(x - 5)(x + 3)
E(x + 15)(x 1)
FThis polynomial cannot be factored by grouping.

a want to know how i can do the method

anonimnystefy · 2011-07-21 03:29:04

hi zee-f

you can do it like this:
x^2 + 2x - 15=
x^2 - 5x + 3x - 15=
x(x-5) + 3(x-5)=
(x+3)(x-5)

the answer is D

zee-f · 2011-07-21 08:54:30

hey guys so i did number 7 the same way i hope i did it correct
so number 7 is x^2-3x-18

x^2-3x-18=
x^2-6x-3x-18

x(x-6)-3(x-6)

(x-3)(x-6)

7. x^2 3x 18

A(x + 3)(x + 6)
B(x + 3)(x - 6)
C(x - 3)(x - 6)
D(x - 3)(x + 6)
E(-x + 3)(x + 6)
FThis polynomial cannot be factored by grouping.

so my answer is c

zee-f · 2011-07-21 09:07:25

i really need help on this this is what i did

so the polynomial is

8x^2+47x+28

(8x^2+7x)+(4x+28)

x(8x+7)+4(x+7)

so i choose (A)

8x^2 + 47x + 28

AThis polynomial cannot be factored by grouping.
B(3x + 7)(5x - 4)
C(3x - 7)(5x - 4)
D(3x + 7)(-5x + 4)
E(-3x + 7)(-5x + 4)
F(3x + 7)(5x + 4)

bobbym · 2011-07-21 09:12:49

Hi zeef;

Did you check to see whether any of the other answers work?

zee-f · 2011-07-21 09:21:21

for the first one yeah the second i tried it like allot of times i just got sick of it and gave up

zee-f · 2011-07-21 09:22:28

how do you do polynomial equation in squares method? can anybody give me a link for an explanation or something plzzzz

bobbym · 2011-07-21 09:29:00

Hi;

Hold on, I agree with your answer of A.

Let's stop here for a second. Did they teach you FOIL?

zee-f · 2011-07-21 09:31:47

nope they didn't teach me the foil its my first time hearing of that method so i did number 7 incorrect ???? can u help me to see what step i did incorrect

bobbym · 2011-07-21 09:34:52

Hi;

The answer is B for that one, how did you get C?

Math Is Fun Forum

#1 2011-07-20 23:56:31

Factoring Polynomials

#2 2011-07-21 00:09:50

Re: Factoring Polynomials

#3 2011-07-21 00:48:44

Re: Factoring Polynomials

#4 2011-07-21 00:50:45

Re: Factoring Polynomials

#5 2011-07-21 00:56:10

Re: Factoring Polynomials

#6 2011-07-21 02:02:39

Re: Factoring Polynomials

#7 2011-07-21 02:07:00

Re: Factoring Polynomials

#8 2011-07-21 02:26:08

Re: Factoring Polynomials

#9 2011-07-21 02:30:49

Re: Factoring Polynomials

#10 2011-07-21 02:35:23

Re: Factoring Polynomials

#11 2011-07-21 02:37:29

Re: Factoring Polynomials

#12 2011-07-21 02:40:08

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#13 2011-07-21 02:40:52

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#14 2011-07-21 02:46:26

Re: Factoring Polynomials

#15 2011-07-21 02:50:28

Re: Factoring Polynomials

#16 2011-07-21 03:10:00

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#17 2011-07-21 03:29:04

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#18 2011-07-21 08:54:30

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#19 2011-07-21 09:07:25

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#20 2011-07-21 09:12:49

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#21 2011-07-21 09:21:21

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