Factoring Polynomials

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Factoring Polynomials. Algebra I. Vocabulary. Factors – The numbers used to find a product. Prime Number – A whole number greater than one and its only factors are 1 and itself. Composite Number – A whole number greater than one that has more than 2 factors. Vocabulary.

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Factoring Polynomials

Algebra I

Vocabulary
• Factors – The numbers used to find a product.
• Prime Number – A whole number greater than one and its only factors are 1 and itself.
• Composite Number – A whole number greater than one that has more than 2 factors.
Vocabulary
• Factored Form – A polynomial expressed as the product of prime numbers and variables.
• Prime Factoring – Finding the prime factors of a term.
• Greatest Common Factor (GCF) – The product of common prime factors.
Prime or Composite?

Ex) 36

Composite.

Factors: 1,2,3,4,6,9,12,18,36

Ex) 23

Prime.

Factors: 1,23

Prime Factorization

Ex) 90 = 2 ∙ 45

= 2∙ 3∙ 15

= 2∙ 3 ∙ 3 ∙ 5

OR use a factor tree:

90

9 10

3 3 2 5

Prime Factorization of Negative Integers

Ex) -140 = -1 ∙ 140

= -1 ∙ 2 ∙ 70

= -1 ∙ 2 ∙ 7 ∙ 10

= -1 ∙ 2 ∙ 7 ∙ 2 ∙ 5

Now you try…

Ex) 96

Ex) -24

Now you try…

Ex) 96

2 ∙ 2 ∙ 2 ∙ 2 ∙ 2 ∙ 3

Ex) -24

-1 ∙ 2 ∙ 2 ∙ 2 ∙ 3

Prime Factorization of a Monomial

12a²b³= 2 · 2 · 3 · a · a · b · b · b

-66pq²= -1 · 2 · 3 · 11 · p · q · q

Finding GCF

Ex) 48 = 2 ∙ 2 ∙ 2 ∙ 2 ∙ 3

60 = 2 ∙ 2 ∙ 3 ∙ 5

GCF = 2 · 2 · 3 = 12

Ex) 15 = 3 · 5

16 = 2 · 2 · 2 · 2

GCF – none = 1

Now you try…

Ex) 36x²y

54xy²z

Now you try…

Ex) 36x²y = 2 · 2 · 3 · 3 · x · x · y

54xy²z = 2 · 3 · 3 · 3 · x · y · y · z

GCF = 18xy

Factoring Using the (Reverse) Distributive Property
• Factoring a polynomial means to find its completely factored form.
Factoring Using the (Reverse) Distributive Property
• First step is to find the prime factors of each term.

Ex) 12a²+ 16a

12a²= 2 · 2 · 3 · a · a

16a = 2 · 2 · 2 · 2 · a

Factoring Using the (Reverse) Distributive Property
• First step is to find the prime factors of each term.
• Next step is to find the GCF of the terms in the polynomial.

Ex) 12a²+ 16a

12a²= 2 · 2 · 3 · a · a

16a = 2 · 2 · 2 · 2 · a

GCF = 4a

Factoring Using the (Reverse) Distributive Property
• First step is to find the prime factors of each term.
• Next step is to find the GCF of the terms in the polynomial.
• Now write what is left of each term and leave in parenthesis.

Ex) 12a²+ 16a

12a²= 2 · 2 · 3 · a · a

16a = 2 · 2 · 2 · 2 · a

4a(3a + 4)

Factoring Using the (Reverse) Distributive Property
• First step is to find the prime factors of each term.
• Next step is to find the GCF of the terms in the polynomial.
• Now write what is left of each term and leave in parenthesis.

Ex) 12a²+ 16a

12a²= 2 · 2 · 3 · a · a

16a = 2 · 2 · 2 · 2 · a

4a(3a + 4)

Another Example:

18cd²+ 12c²d + 9cd

Another Example:

18cd²+ 12c²d + 9cd

18cd² = 2 · 3 · 3 · c · d · d

12c²d = 2 · 2 · 3 · c · c · d

9cd = 3 · 3 · c · d

GCF = 3cd

Answer: 3cd(6d + 4c + 3)