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SECTION 9-5
Multiplying Binomials
ESSENTIAL QUESTION


How do you multiply binomials?



Where you’ll see this:

  Finance, geography, recreation, photography
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

     2
6x
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

     2
6x
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

   2
6x −4x
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

   2
6x −4x
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

   2
6x −4x +12x
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

   2
6x −4x +12x
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

   2
6x −4x +12x −8
EXAMPLE 1
                      Simplify.
                                            2
a. (2x + 4)(3x − 2)               b. (2x + 3)

   2
6x −4x +12x −8

       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8

       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8

       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                       2
                                  4x
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                       2
                                  4x
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                     2
                                  4x +6x
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                     2
                                  4x +6x
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                               2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                     2
                                  4x +6x +6x
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                               2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                     2
                                  4x +6x +6x
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                     2
                                  4x +6x +6x +9
       2
  6x + 8x − 8
EXAMPLE 1
                      Simplify.
                                              2
a. (2x + 4)(3x − 2)                 b. (2x + 3)

                                  (2x + 3)(2x + 3)
   2
6x −4x +12x −8
                                     2
                                  4x +6x +6x +9
       2
  6x + 8x − 8
                                      2
                                   4x +12x + 9
EXPLORE
Multiply by hand: 32 X 45


             32
         x   45
EXPLORE
Multiply by hand: 32 X 45


             32
         x   45
              0
EXPLORE
Multiply by hand: 32 X 45

             1
             32
         x   45
              0
EXPLORE
Multiply by hand: 32 X 45

           1
           32
         x 45
         16 0
EXPLORE
Multiply by hand: 32 X 45

           1
           32
         x 45
         16 0
            0
EXPLORE
Multiply by hand: 32 X 45

           1
           32
         x 45
         16 0
           80
EXPLORE
Multiply by hand: 32 X 45

           1
           32
         x 45
         16 0
        128 0
EXPLORE
Multiply by hand: 32 X 45

           1
           32
         x 45
         16 0
        128 0
EXPLORE
Multiply by hand: 32 X 45

           1
           32
         x 45
         16 0
        128 0
        1440
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
       −24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
   12w −24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
   12w −24
   −2w
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
   12w −24
 2
w −2w
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

    (w − 2)
    (w +12)
   12w −24
 2
w −2w
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)
       (w +12)
      12w −24
    2
 w −2w
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)
      12w −24
    2
 w −2w
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24
    2
 w −2w
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24
    2
 w −2w
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24                             −3
    2
 w −2w
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24                        −9a −3
    2
 w −2w
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24                        −9a −3
    2
 w −2w                                +a
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24                       −9a −3
    2                               2
 w −2w                            3a +a
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                        (3a +1)
       (w +12)                         (a − 3)
      12w −24                       −9a −3
    2                               2
 w −2w                            3a +a
  2
w +10w − 24
EXAMPLE 2
                    Simplify.

a. (w − 2)(w +12)               b. (3a +1)(a − 3)

       (w − 2)                         (3a +1)
       (w +12)                          (a − 3)
      12w −24                        −9a −3
    2                                2
 w −2w                            3a +a
  2                                2
w +10w − 24                      3a − 8a − 3
PROBLEM SET
PROBLEM SET



            p. 398 #1-48, multiples of 3




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Int Math 2 Section 9-5 1011

  • 2. ESSENTIAL QUESTION How do you multiply binomials? Where you’ll see this: Finance, geography, recreation, photography
  • 3. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3)
  • 4. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3)
  • 5. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x
  • 6. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x
  • 7. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x −4x
  • 8. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x −4x
  • 9. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x −4x +12x
  • 10. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x −4x +12x
  • 11. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x −4x +12x −8
  • 12. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) 2 6x −4x +12x −8 2 6x + 8x − 8
  • 13. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 6x + 8x − 8
  • 14. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 6x + 8x − 8
  • 15. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x 2 6x + 8x − 8
  • 16. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x 2 6x + 8x − 8
  • 17. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x +6x 2 6x + 8x − 8
  • 18. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x +6x 2 6x + 8x − 8
  • 19. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x +6x +6x 2 6x + 8x − 8
  • 20. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x +6x +6x 2 6x + 8x − 8
  • 21. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x +6x +6x +9 2 6x + 8x − 8
  • 22. EXAMPLE 1 Simplify. 2 a. (2x + 4)(3x − 2) b. (2x + 3) (2x + 3)(2x + 3) 2 6x −4x +12x −8 2 4x +6x +6x +9 2 6x + 8x − 8 2 4x +12x + 9
  • 23. EXPLORE Multiply by hand: 32 X 45 32 x 45
  • 24. EXPLORE Multiply by hand: 32 X 45 32 x 45 0
  • 25. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 0
  • 26. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 16 0
  • 27. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 16 0 0
  • 28. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 16 0 80
  • 29. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 16 0 128 0
  • 30. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 16 0 128 0
  • 31. EXPLORE Multiply by hand: 32 X 45 1 32 x 45 16 0 128 0 1440
  • 32. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3)
  • 33. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2)
  • 34. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12)
  • 35. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12)
  • 36. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12) −24
  • 37. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12) 12w −24
  • 38. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12) 12w −24 −2w
  • 39. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12) 12w −24 2 w −2w
  • 40. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12) 12w −24 2 w −2w
  • 41. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (w +12) 12w −24 2 w −2w 2 w +10w − 24
  • 42. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) 12w −24 2 w −2w 2 w +10w − 24
  • 43. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 2 w −2w 2 w +10w − 24
  • 44. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 2 w −2w 2 w +10w − 24
  • 45. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 −3 2 w −2w 2 w +10w − 24
  • 46. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 −9a −3 2 w −2w 2 w +10w − 24
  • 47. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 −9a −3 2 w −2w +a 2 w +10w − 24
  • 48. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 −9a −3 2 2 w −2w 3a +a 2 w +10w − 24
  • 49. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 −9a −3 2 2 w −2w 3a +a 2 w +10w − 24
  • 50. EXAMPLE 2 Simplify. a. (w − 2)(w +12) b. (3a +1)(a − 3) (w − 2) (3a +1) (w +12) (a − 3) 12w −24 −9a −3 2 2 w −2w 3a +a 2 2 w +10w − 24 3a − 8a − 3
  • 52. PROBLEM SET p. 398 #1-48, multiples of 3 “An opinion should be the result of a thought, not a substitute for it.” Jeff Mallett

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