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Opener:
Solve each of the    1. 5+x = 5       2. 5x=0
following for x. 




                     3. 11x + 2 = 2   4. x(x‐5)= 0




                      




                                                     1
Homework 
Questions:




             2
7.3   The Zero Product Property
Topic One:            What values of x make the following expression equal to 
Redefining  ZPP       zero?
                                   x2+5x+6




                      What values of x make the following expression equal to 
                      zero?
                                   (x+2)(x+3)




                      What is true about these two expressions?




                      Which form made it easier to find the values of x that 
                      make the expression equal to zero?




                                                                                 3
Topic One:               The product of two numbers is zero if and only if one or 
Redefining  ZPP          both of the numbers is zero.

                         If a and b are numbers, then ....




                        Solve for x in each of the following.

                (Ex. 1) 3x (5x ‐ 2)= 0




                 (Ex. 2) (2x‐8)(5x +3) = 0




 It's Your Turn!!!
                (Ex. 3) ‐2(3x+7) = 0




                (Ex. 4) (x+5)(6x+1)=0




                                                                                     4
Topic One:
Redefining  ZPP
What's wrong here???

Discuss the following    Mandy and Billy need to find all the solutions to the equation 
with your partner.       (x+7)(x+11)=77.

                         Mandy says, "I can break up the equation into two simpler 
                         ones:
                              (x+7)(x+11)=77 ⇒x+7 = 77 or x+11=77.
                         So there are two answers, x=70 or x=66."

                         Billy replies, " I think you're wrong.  I think the solution is x=
                         0."

                         Who is correct?  How do you know he/she is?  What is wrong 
                         with the other person's answer?




                                                                                              5
Topic Two:            To factor an expression means to write it as the product 
Factoring with the    of two or more expressions.
GCF
                      Factor each of the following using GCF.



               (Ex. 5) 16x2 +8x




              (Ex. 6) 5x3y2 + 15xy




                                                                                  6
Topic Three:          Factor the following.  Then, use ZPP to find solutions for 
Using Factoring with  x.
ZPP
               (Ex. 7) x3 ‐ 9x=0




               (Ex. 8) x3=25x




 Let's get Nspired!    Graph f(x)=x3 ‐ 25x.  Where does the graph cross the x‐
                       axis?  Do you see any correlation between this and our 
                       answer to #6?




                                                                                    7
Exit Slip:   Factor each equation.  Then use ZPP to find the 
             solutions to each equation.


             1.) 3x2=9x




             2.) x2+7x=0




                                                                8
9

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7 3 Zero Product Property A

  • 1. Opener: Solve each of the  1. 5+x = 5 2. 5x=0 following for x.  3. 11x + 2 = 2 4. x(x‐5)= 0   1
  • 3. 7.3   The Zero Product Property Topic One: What values of x make the following expression equal to  Redefining  ZPP zero? x2+5x+6 What values of x make the following expression equal to  zero? (x+2)(x+3) What is true about these two expressions? Which form made it easier to find the values of x that  make the expression equal to zero? 3
  • 4. Topic One: The product of two numbers is zero if and only if one or  Redefining  ZPP both of the numbers is zero. If a and b are numbers, then .... Solve for x in each of the following. (Ex. 1) 3x (5x ‐ 2)= 0 (Ex. 2) (2x‐8)(5x +3) = 0 It's Your Turn!!! (Ex. 3) ‐2(3x+7) = 0 (Ex. 4) (x+5)(6x+1)=0 4
  • 5. Topic One: Redefining  ZPP What's wrong here??? Discuss the following  Mandy and Billy need to find all the solutions to the equation  with your partner. (x+7)(x+11)=77. Mandy says, "I can break up the equation into two simpler  ones: (x+7)(x+11)=77 ⇒x+7 = 77 or x+11=77. So there are two answers, x=70 or x=66." Billy replies, " I think you're wrong.  I think the solution is x= 0." Who is correct?  How do you know he/she is?  What is wrong  with the other person's answer? 5
  • 6. Topic Two: To factor an expression means to write it as the product  Factoring with the  of two or more expressions. GCF Factor each of the following using GCF. (Ex. 5) 16x2 +8x (Ex. 6) 5x3y2 + 15xy 6
  • 7. Topic Three: Factor the following.  Then, use ZPP to find solutions for  Using Factoring with  x. ZPP (Ex. 7) x3 ‐ 9x=0 (Ex. 8) x3=25x Let's get Nspired! Graph f(x)=x3 ‐ 25x.  Where does the graph cross the x‐ axis?  Do you see any correlation between this and our  answer to #6? 7
  • 8. Exit Slip: Factor each equation.  Then use ZPP to find the  solutions to each equation. 1.) 3x2=9x 2.) x2+7x=0 8
  • 9. 9