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Factoring Quadratics 4.2.notebook 1 April 04, 2018

Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Page 1: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

Factoring Quadratics 4.2.notebook

1

April 04, 2018

Page 2: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

Factoring Quadratics 4.2.notebook

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April 04, 2018

4.2:Factoring Quadratic Trinomial 

Expressions when "a= 1"

Objectives:Students will be able to factor quadratic expressions

Page 3: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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What is standard form of a quadratic function? 

y = ax2 + bx + c

Page 4: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Distribute!

(x + 3)(x ­ 8)

x2 ­8x +3x ­24

x(x ­8) + 3(x ­8)

x2 ­5x ­24

1. Everyone in first parentheses wants to meet everyone in second! 

﴾move to reveal﴿

2. Multiply! ﴾move to reveal﴿

3. Combine like terms

Page 5: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

Factoring Quadratics 4.2.notebook

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Your Turn!Distribute the following....

x2 + 9x + 20Pull for answer

(x + 4)(x + 5)

(2x ­1)(x ­ 3) 2x2 ­ 7x + 3Pull for answer

Page 6: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Factoring is re­writing an expression as a product its factors or 

"undistributing"

Distributing re­writes the expression 

from factored form to 

standard form. 

Page 7: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Pull tab to here!

Remember this distributing example?

(x + 3)(x ­ 8)

x2 ­8x +3x ­24x(x ­8) + 3(x ­8)

x2 ­5x ­24What is the 

relationship between 3, ­8 and ­24?

What is the relationship between 

3, ­8 and ­5?

Pull

Pull

Stuck?? Erase below..(3)(­8) = ­24  and 3 + ­8 = ­5

Page 8: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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April 04, 2018

(x + 3)(x ­ 8)

x2 ­8x +3x ­24

x(x ­8) + 3(x ­8)

x2 ­5x ­24

2. Find two numbers with product of ­24 and 

sum of ­ 5

3. Factor 1st two terms

Factor 2nd two terms

4. Write two factors

1. Start in standard form

Let's look at distributing in 

reverse!

Page 9: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Steps to Factor Quadratic Expressions!

Page 10: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Page 11: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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How can I check my answer?

Page 12: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Your Turn!Factor the following....

(x +4)(x +5)Pull for answer

x2 +9x +20

2x2 ­7x +3 (2x ­1)(x ­3)Pull for answer

Page 13: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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Page 14: Factoring Quadratics 4.2.notebook - Mrs. Bartlettbartlettstp.weebly.com/uploads/2/3/0/2/23023680/april_4_-_factoring_part_a.pdfFactoring Quadratics 4.2.notebook 8 April 04, 2018 (x

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April 04, 2018