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Factoring Polynomials

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**Factoring a polynomial means expressing it as a product of other polynomials.**

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**A “Difference of Squares” is a binomial (. 2 terms only**

A “Difference of Squares” is a binomial (*2 terms only*) and it factors like this:

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Factoring Method #1 Factoring polynomials with a common monomial factor (using GCF). **Always look for a GCF before using any other factoring method.

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**Steps: 1. Find the greatest common factor (GCF).**

2. Divide the polynomial by the GCF. The quotient is the other factor. 3. Express the polynomial as the product of the quotient and the GCF.

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Step 1: Step 2: Divide by GCF

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**The answer should look like this:**

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**Factor these on your own looking for a GCF.**

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Factoring Technique #2 Factoring By Grouping for polynomials with 4 or more terms

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Factoring By Grouping 1. Group the first set of terms and last set of terms with parentheses. 2. Factor out the GCF from each group so that both sets of parentheses contain the same factors. 3. Factor out the GCF again (the GCF is the factor from step 2).

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**Step 2: Factor out GCF from each group**

Example 1: Step 1: Group Step 2: Factor out GCF from each group Step 3: Factor out GCF again

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Example 2:

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Factoring Method #3 Factoring a trinomial in the form:

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**2. Product of first terms of both binomials **

Factoring a trinomial: 1. Write two sets of parenthesis, ( )( ). These will be the factors of the trinomial. 2. Product of first terms of both binomials must equal first term of the trinomial. Next

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**Factoring a trinomial:**

3. The product of last terms of both binomials must equal last term of the trinomial (c). 4. Think of the FOIL method of multiplying binomials, the sum of the outer and the inner products must equal the middle term (bx).

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**x -2 -4 O + I = bx ? Factors of +8: 1 & 8 2 & 4 -1 & -8 -2 & -4**

1x + 8x = 9x 2x + 4x = 6x -1x - 8x = -9x -2x - 4x = -6x

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**Check your answer by using FOIL**

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Example #2: x2+5x+4

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Example #3: x2-6x+5

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Example #4: x2-5x+6

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Example #4: x2-2x-24

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**Answers (x+8)(x+4) (x-5)(x+3) (y2+1)(y2+2) (x+6)(x-3) (z+4)(z+5)**

(k-9)(k+3)

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**When a>1 and c>1, there may be more combinations to try!**

Step 1:

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**Always check for GCF before you do anything else.**

Lets do another example: Don’t Forget Method #1. Always check for GCF before you do anything else. Find a GCF Factor trinomial

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Example #2: 2x2 + 2x - 40

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Example #3: 5x5 – 48x4 + 27x3

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**Factoring a perfect square trinomial in the form:**

Factoring Technique #3 continued Factoring a perfect square trinomial in the form:

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Perfect Square Trinomials can be factored just like other trinomials (guess and check), but if you recognize the perfect squares pattern, follow the formula!

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a b Does the middle term fit the pattern, 2ab? Yes, the factors are (a + b)2 :

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a b Does the middle term fit the pattern, 2ab? Yes, the factors are (a - b)2 :

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**Factoring polynomials that are a difference of squares.**

Factoring Method #4 Factoring polynomials that are a difference of squares.

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**To factor, express each term as a square of a monomial then apply the rule...**

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**Here is another example:**

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Try these on your own:

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**Method #5: Sum and Difference of Cubes**

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**Write each monomial as a cube and apply either of the rules.**

Rewrite as cubes Apply the rule for sum of cubes:

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Rewrite as cubes Apply the rule for difference of cubes:

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Try these on your own:

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Answers:

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5.1 Factoring – the Greatest Common Factor

5.1 Factoring – the Greatest Common Factor

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