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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

hi bob

about the perfect squares method:

let us take your example 9x^2+30x+25=

9(x^2+10x/3+25/9)=

9(x^2+10x/3+(5/3)^2)=

9(x+5/3)^2=

3^2(x+5/3)^2=

(3x+5)^2

also i did in school something ike this:

x^2-5x+6=

x^2-5x+(5/2)^2-(5/2)^2+6=

(x-5/2)^2-25/4+4=

(x-5/2)^2-1/4=

(x-5/2)^2-(1/2)^2

then we use the difference of squares:

(x-5/2-1/2)(x-5/2+1/2)=

(x-6/2)(x-4/2)=

(x-3)(x-2)

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

wow that was helpful yeah u do allot of math with pictures it really makes it more organized i personally liked the grouping method it was fun in a weird way

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

i got 14-a 15-a 16- d

14. x^2 + 18x + 81

A(x + 9)(x + 9)

B(-x + 9)(-x + 9)

C(x - 9)(x - 9)

D(x + 9)(x - 9)

E(x - 9)(-x + 9)

FThis polynomial cannot be factored by using the perfect squares method.

15. x^2 3x + 16

A(x 4)(x 4)

B(x 4)(x + 4)

C(x + 4)(x + 4)

D(x + 4)(x 4)

E(-x 4)(-x 4)

FThis polynomial cannot be factored by using the perfect squares method.

16. 4x^4 20x^2 + 25

A(2x^2 + 5)(2x^2 + 5)

B(2x^2 5)(2x^2 + 5)

C(-2x^2 5)(-2x^2 5)

D(2x^2 5)(2x^2 5)

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

FThis polynomial cannot be factored by using the perfect squares method

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

hi zee-f

14 and 16 are correct but 15 isn't.how did you get your answer and did you check to see if it is correct?

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,586

a picture speaks a thousand words

Bob

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

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

hey guys so i revised my answer for #15 This polynomial cannot be factored by using the perfect squares method because when i multiply the x *4*2 its going to give me 8x so thats not what the middle term is this cant be done using the squares method

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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**anonimnystefy****Real Member**- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,015

hi zee-f

that is correct.actualy it cannot be factored by any method if you don't use complex numbers.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

The knowledge of some things as a function of age is a delta function.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,339

Hi;

That is correct. If you multiply out all of the choices you will see that none them is correct, so the answer must be F.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

i also used this website it made the method sooooo easy u guys can check it out it cleared the idea alotttt http://www.ehow.com/how_5953961_factor-polynomials-perfect-squares.html

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,339

Hi;

That is a nice site, did you find yourself?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

yup i just searched it on yahooo on how to do the squared method i needed a more clarification thanx allot for alll the help guysss

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,339

Thanks for that page!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

17. x^2 + 2x + 1

AThis polynomial could be factored by finding the GCF, then by grouping or using the perfect squares method.

BThis polynomial could be factored by using the difference of squares method, perfect squares method, or grouping.

CThis polynomial could be factored only by using the perfect squares method.

DThis polynomial could be factored only by using the difference of squares method.

EThis polynomial could be factored by using grouping or the perfect squares methods.

FThis polynomial cannot be factored by any of the methods used in this lesson.

i choose (A)

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

18. 2x^3 + 4x^2 + 2x

AThis polynomial could be factored by finding the GCF, then by grouping or using the perfect squares method.

BThis polynomial could be factored by using the difference of squares method, perfect squares method, or grouping.

CThis polynomial could be factored only by using the perfect squares method.

DThis polynomial could be factored by using grouping or the perfect squares methods.

EThis polynomial could be factored only by using the difference of squares method.

FThis polynomial cannot be factored by any of the methods used in this lesson.

i choose (A)

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

19. x^2 169 i choose (E)

AThis polynomial could be factored by finding the GCF, then by grouping or using the perfect squares method.

B This polynomial could be factored by using the difference of squares method or grouping.

CThis polynomial could be factored only by using the perfect squares method.

DThis polynomial could be factored by using grouping or the perfect squares methods.

EThis polynomial could be factored only by using the difference of squares method.

FThis polynomial cannot be factored by any of the methods used in this lesson.

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

20. x^2 + 5x 7 i choose (A)

AThis polynomial could be factored by finding the GCF, then by grouping or using the perfect squares method.

BThis polynomial could be factored by using the difference of squares method, perfect squares method, or grouping.

CThis polynomial could be factored only by using the perfect squares method.

DThis polynomial could be factored by using grouping or the perfect squares methods.

EThis polynomial could be factored only by using the difference of squares method.

FThis polynomial cannot be factored by any of the methods used in this lesson.

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

so did i do wellllllll ???????

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,339

How did you get the GCF of 17

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

the question says

For problems 17 20, identify which of the methods from this lesson (GCF, grouping, difference of squares, or perfect squares) could be used to factor the polynomial.

17 can be factorized by using the gcf right ?

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

if not it has to be c or e

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,339

I do not think so, is there a common factor for each term?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

nope it cant be factored by the gcf

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

i like c what do u think because it cant be done by the difference square method

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 104,339

Hi;

(x+1)^2 is the factorization.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

Factoring Perfect Squares

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