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Factoring

Factoring. Polynomials. Factoring a polynomial means expressing it as a product of other polynomials. Factoring Method #1. Factoring polynomials with a common monomial factor (using GCF). **Always look for a GCF before using any other factoring method. Steps:.

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Factoring

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  1. Factoring Polynomials

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

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

  4. 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.

  5. Step 1: Step 2: Divide by GCF

  6. The answer should look like this:

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

  8. Factoring Method #2 Factoring polynomials that are a difference of squares.

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

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

  11. Here is another example:

  12. Try these on your own:

  13. End of Day 1

  14. Sum and Difference of Cubes:

  15. Apply the rule for sum of cubes: Write each monomial as a cube and apply either of the rules. Rewrite as cubes

  16. Apply the rule for difference of cubes: Rewrite as cubes

  17. Factoring a trinomial in the form: where a = 1 Factoring Method #3

  18. Factoring a trinomial: 1. Write two sets of parenthesis, (x )(x). These will be the factors of the trinomial. 2. Find the factors of the c term that add to the b term. For instance, let c = d·eand d+e = b then the factors are (x+d)(x+e ). . Next

  19. x x -2 -4 1 + 8 = 9 2 + 4 = 6 -1 - 8 = -9 -2 - 4 = -6 Factors of +8: 1 & 8 2 & 4 -1 & -8 -2 & -4 Factors of +8 that add to -6

  20. F O I L Check your answer by using FOIL

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

  22. When a>1, let’s do something different! Step 1: Multiply a · c = - 30 Step 2: Find the factors of a·c (-30) that add to the b term

  23. Factors of 6 · (-5) :1, -30 1+-30 = -29 -1, 30 -1+30 = 29 2, -15 2+-15 =-13 -2, 15 -2+15 =13 3, -10 3+ -10 =-7 -3, 10 -3+ 10 =7 5, -6 5+ -6 = -2 -5, 6 -5+6 =1 Step 2: Find the factors of a·c that add to the b term Let a·c = d and d = e·f then e+f = b d = -30 e = -2 f = 15

  24. -2, 15 -2+15 =13 Step 3: Rewrite the expression separating the b term using the factors e and f -2x+15x -5 13x Step 4: Group the first two and last two terms. -2x + 15x -5

  25. Step 4: Group the first Two and last two terms. Step 5: Factor GCF from each group Check!!!! If you cannot find two common factors, Then this method does not work. Step 6: Factor out GCF - 2x + 15x - 5 3x - 1)+ 5(3x - 1) Common factors 3x - 1)(2x + 5)

  26. I am not a fan of guess and check! Try: F O I L Step 3: Place the factors inside the parenthesis until O + I = bx. This doesn’t work!! O + I = 30 x - x = 29x

  27. F O I L Switch the order of the second terms and try again. This doesn’t work!! O + I = -6x + 5x = -x

  28. F O I L O+I = 15x - 2x =13x IT WORKS!! Try another combination: Switch to 3x and 2x

  29. Factoring Technique #3 continued Factoring a perfect squaretrinomial in the form:

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

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

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

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

  34. 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). Factoring By Grouping

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

  36. Example 2:

  37. Try these on your own:

  38. Answers:

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