# Factoring Polynomials: The G.C.F. - PowerPoint PPT Presentation

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Factoring Polynomials: The G.C.F. Factoring Out The Greatest Common Factor. C. G. F. What is a FACTOR?. product. factor. factor. a and b are factors of c. A FACTOR is a number or an expression that is multiplied with at least one other number or expression to form a PRODUCT.

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Factoring Polynomials: The G.C.F.

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### Factoring Polynomials:The G.C.F.

Factoring Out The

Greatest Common Factor

C

G

F

KM & PP

### What is a FACTOR?

product

factor

factor

a and b are factors of c

A FACTOR is a number or an expression that is multiplied with at least one other number or expression to form a PRODUCT.

KM & PP

### What are the Factors of 12?

1

1 x 12 = 12

12

12

2 x 6 = 12

2

6

12

3

3 x 4 = 12

4

12

Factors of 12: 1, 2, 3, 4, 6, 12

KM & PP

### What are the Factors of 20?

1

1 x 20 = 20

20

20

2 x 10 = 20

2

10

20

4

4 x 5 = 20

5

20

Factors of 20: 1, 2, 4, 5, 10, 20

KM & PP

### What is a COMMON FACTOR?

If

and

then b is a "common factor" of x and y.

If two or more numbers or expressions have the same factor, that factor is called a COMMON FACTOR.

KM & PP

### What if the only COMMON FACTORis 1 ?

If the only common factor of two or more numbers or expressions is the number 1,

we say the numbers or expressions are:

Relatively Prime

KM & PP

### What are the COMMON FACTORS of 16 and 27?

Factors of 16: 1, 2, 4, 8, 16

Factors of 27: 1, 3, 9, 27

1

2

3

4

9

8

16

27

16 and 27 are RELATIVELY PRIME

KM & PP

### What are the COMMON FACTORS of 12 and 20?

Factors of 12: 1, 2, 3, 4, 6, 12

Factors of 20: 1, 2, 4, 5, 10, 20

1

2

5

3

10

4

6

20

12

Common Factors of 12 and 20: 1, 2, 4

KM & PP

### What is theGreatest Common Factorof 12 and 20?

Common Factors of 12 and 20: 1, 2, 4

The largest number in the list ofcommon factors is 4.

The Greatest Common Factor of 12 and 20 is 4.

KM & PP

### What are theCommon Factorsof x3 and x5?

Factors of x3: 1, x1, x2, x3

Factors of x5: 1, x1, x2, x3,x4, x5

1

x4

x1

x2

x5

x3

Common Factors of x3 and x5: 1, x1, x2, x3

KM & PP

### What is theGreatest Common Factorof x3 and x5?

Common Factors of x3 and x5: 1, x1, x2, x3

The largest number (disregarding the sign) in the list of common factors is x3.

The Greatest Common Factor of x3 and x5 is x3.

KM & PP

### What is theGreatest Common Factorof xn and xm?

TheGreatest Common Factor of xn and xm is the term that has the smaller exponent.

GCF of x7 and x2 is x2.

GCF of x4 and x8 is x4.

GCF of x and x3 is x.

KM & PP

### What is theGreatest Common Factorof 12x3 and 20x5?

The Greatest Common Factor of 12 and 20 is 4.

The Greatest Common Factor of x3 and x5 is x3.

The Greatest Common Factor of 12x3 and 20x5 is 4x3.

KM & PP

### Finding theGreatest Common Factor“The Algebraic Approach”

To Determine the GCF:1) Factor each expression completely2) The GCF is the product of the common bases each raised to the smallest exponent

Let’s try a few examples!

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### Let’s Build theGreatest Common Factorof 12x3 and 20x5

The GCF of 12x3 and 20x5 is the product of the “common” bases raised to the smallest exponent.or

KM & PP

### Let’s Build theGreatest Common Factorof 90x2y3zand 50y4z5

The GCF of 90x2y3zand 50y4z5 is the product of the “common” bases raised to the smallest exponent.or

KM & PP

### Let’s Build theGreatest Common Factorof 21xy5zand 30y4

The GCF of 21xy5zand 30y4 is the product of the “common” bases raised to the smallest exponent.or

KM & PP

### Let’s Build theGreatest Common Factorof 21x2zand 10y4

21x2zand 10y4 have no common factors!The only factor common to both expressions is 1. 21x2zand 10y4 are RELATIVELY PRIMEbecause their GCF is 1.

KM & PP

### What does it mean to FACTOR?

factor

factor

c has been factored into the product of a and b

When a number, expression, or polynomial is rewritten as a product of factors, we say it has been FACTORED .

KM & PP

### Factoring out the GCFis Reversing the Distributive Property

+

+

(

)

+

=

Now let's try an example!

KM & PP

### Factor out the GCFfrom 12x5 + 20x3

12x5

+

20x3

GCF

GCF

+

5

4x3

3x2

4x3

GCF

(

)

4x3

+

3x2

5

=

Reverse Distributive Property

KM & PP

### Factor: 12x5 + 20x3

So, by reversing the Distributive Property, the binomial

12x5 + 20x3

can be written as the product

4x3(3x2 + 5)

12x5 + 20x3

= 4x3(3x2 + 5)

product

sum

KM & PP

### Factor: 24x3 + 18x

The GCF of 24 and 18 is 6.The GCF of x3 and x is x.The GCF of 24x3 and 18x is 6x.

sum

GCF

GCF

24x3 + 18x

= 6x(4x2) + 6x(3)

GCF

= 6x(4x2 + 3)

product

KM & PP

### Factor: 17x4 - 8x3

The GCF of 17 and 8 is 1.The GCF of x4 and x3 is x3.The GCF of 17x4 and x3 is 1x3 orx3.

sum

GCF

GCF

= x3(17x) – x3(8)

17x4 - 8x3

GCF

= x3(17x - 8)

product

KM & PP

### Factor: 6x2y5 - 8x3y4

GCF of 6 and 8 is 2GCF of x2y5 and x3y4 is x2y4GCF of 6x2y5 and 8x3y4 is 2x2y4

sum

6x2y5- 8x3y4

GCF

GCF

= 2x2y4(3y) –2x2y4(4x)

GCF

= 2x2y4(3y - 4x)

product

KM & PP

### Factor:9x3 - 12x2 + 3x

GCF of 9, 12 and 3 is 3GCF of x3, x2 and x is xGCF of 9x3, 12x2 and 3x is 3x

sum

9x3 - 12x2 + 3x

GCF

GCF

GCF

= 3x(3x2) - 3x(4x)+ 3x(1)

GCF

= 3x(3x2 - 4x + 1)

product

KM & PP

### Factor:9x3 – 11y2 + 3

GCF of 9, 11 and 3 is 1GCF of x3 and y2 is 1GCF of 9x3, 11y2 and 3 is 1

9x3 – 11y2 + 3

Prime or Nonfactorable

so leave it as is!

=1(9x3 – 11y2 + 3)

shown with the GCF factored out

KM & PP

### Factor a Tricky One!

x(x + 2) – 6(x + 2)

GCF

GCF

x(x + 2) – 6(x + 2)

GCF

= ( x + 2 )( x – 6 )

KM & PP

### Another Tricky One!

(x-7)3x + (x-7)5

GCF

GCF

(x - 7)3x +(x - 7)5

GCF

= ( x - 7 )( 3x + 5 )

KM & PP

KM & PP