chapter 5.5(a) the gcf and factoring by grouping.notebook

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Chapter 5.5(a) The GCF and Factoring by Grouping.notebook 1 January 30, 2017 Jan 158:12 AM Bellwork: 1) Write the equation of the line with an undefined slope that passes through the point (4, 8). 2) Simplify: a. (2a 2 b) 3 (a 2 b 4 ) 2 b. 2x2y 5 (2xy 2 ) 4 Multiply: 3) 3x 2 y(4x 2 y 4xy + 4x) 4) (3x 5)(4x + 1) 5) (3x 5) 2 Jan 158:24 AM Chapter 5.5(a) The greatest Common Factor and Factoring by Grouping. Identify and factor out the greatest common factor. Jan 158:27 AM Factoring is the reverse process of Multiplying. It is the process of writing a polynomial as a product. (2x 3)(x + 4) = 2x 2 + 5x 12 multiplying factoring There are several different methods of factoring that we will learn over the next couple of weeks. Jan 158:46 AM We start with factoring out the Greatest Common Factor (GCF). Finding the GCF of List of Monomials Step 1: Find the GCF of the numerical coefficients. Step 2: Find the GCF of the variable factors. Step 3: The product of the factors found in Steps 1 and 2 is the GCF of the monomials. Jan 1510:28 AM 1) Find the GCF of the following monomials: a) 72r 2 s 2 , 36rs 3 b) 18a 2 , 48a 4 c) 8ab 4 , 20a 2 b 4 and 28ab 3 Jan 1510:33 AM We are now going to factor a polynomial by factoring out the GCF using the distributive property. This is the opposite of multiplying a monomial by a polynomial. 3x(4x 2 + 3x 2) Factoring out the GCF: 12a 5 + 6a 3 + 4a First find the GCF of the terms: Factor out the GCF: Apply the distributive property:

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Chapter 5.5(a) The GCF and Factoring by Grouping.notebook

1

January 30, 2017

Jan 15­8:12 AM

Bellwork: 

1) Write the equation of the line with an undefined slope that passes through the point (4, 8).

2) Simplify: a. (2a2b)3(a2b­4)2 b. 2x2y­5   (2xy2)4

Multiply:

3) 3x2y(4x2y ­ 4xy + 4x)  4) (3x ­ 5)(4x + 1)

5) (3x ­ 5)2

Jan 15­8:24 AM

Chapter 5.5(a) The greatest Common Factor and Factoring by Grouping.

Identify and factor out the greatest common factor. 

Jan 15­8:27 AM

Factoring is the reverse process of Multiplying. It is the process of writing a polynomial as a product.

(2x ­ 3)(x + 4) = 2x2 + 5x ­12

multiplying

factoring

There are several different methods of factoring that we will learn over the next couple of weeks.

Jan 15­8:46 AM

We start with factoring out the Greatest Common Factor (GCF).

Finding the GCF of List of Monomials

Step 1: Find the GCF of the numerical coefficients.Step 2: Find the GCF of the variable factors.Step 3: The product of the factors found in Steps 1 and 2 

is the GCF of the monomials.

Jan 15­10:28 AM

1) Find the GCF of the following monomials:

a) 72r2s2, 36rs3 b) 18a2, 48a4

c) 8ab4, 20a2b4 and 28ab3

Jan 15­10:33 AM

We are now going to factor a polynomial by factoring out the GCF using the distributive property.

This is the opposite of multiplying a monomial by a polynomial.   3x(4x2 + 3x ­ 2)

Factoring out the GCF: 12a5 + 6a3 + 4a

First find the GCF of the terms:

Factor out the GCF:

Apply the distributive property:

Chapter 5.5(a) The GCF and Factoring by Grouping.notebook

2

January 30, 2017

Jan 15­10:35 AM

2) Factor:a. 9b2 + 3

b. 20y2 ­ 4y3 + 12y4

c. 6a ­ 7b2

Check your Answer:Multiply the factors together and see if it equals the original polynomial.

Jan 15­10:43 AM

At times there are two different factors we can pull out, one positive and one negative.

3) Factor:

a. ­2x2y ­ 4xy + 10y

b. ­9x4y2 + 5x2y2 + 7xy2

Jan 15­10:44 AM

Which factorization of 6x2 + 9x ­ 12 is correct?

a. 3(2x2 + 3x + 4) b. 3(2x2 + 3x ­ 4)

c. 3(2x2 + 3x ­ 1)     d. 3(2x2 + 3x)      

Jan 15­10:48 AM

Homework

Factor out the GCF WS

Jan 19­3:51 PM