Factoring trinomials

Factoring trinomials
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WiskundeMiddelbare schoolhavoLeerjaar 3

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Factoring trinomials
You need your Ipad and notebook

Slide 1 - Diapositive

Today
  • Start (5 min)
  • New subject (20 min)
  • Bettermarks (20 min)
  • End lesson (5 min)

Slide 2 - Diapositive

Recap last lesson
13.2: Factoring binomials

Factor:
15p2+10p

Slide 3 - Diapositive

Factor:
10r2+14r
timer
1:00

Slide 4 - Question ouverte

Recap 13.2 Factoring binomials
Factor:
10r2+14r

Slide 5 - Diapositive

Recap 13.2 Factoring binomials
Factor:

Solve:
10r2+14r
10r2+14r=0

Slide 6 - Diapositive

Solve:
4x2+7x=0
timer
2:00

Slide 7 - Question ouverte

Solve:
4x2+7x=0

Slide 8 - Diapositive

Find a, b and c in the formula
12x25x+17
timer
1:00

Slide 9 - Question ouverte

Note 13.3: Factoring trinomials
When factoring trinomials you are going to use the product-sum method. You need to find two numbers whose product (multiplied) is c and whose sum (added) is b.

Example: Factor


So 
x2+29x+100
425=100
4+25=29
x2+29x+100=(x+4)(x+25)
timer
4:00

Slide 10 - Diapositive

Factorizing trinomials
x2+7x+10

Slide 11 - Diapositive

Factor
x2+9x+8
timer
1:00

Slide 12 - Question ouverte

Factor
x2+9x+8

Slide 13 - Diapositive

Factor
x2+19x+90
timer
1:00

Slide 14 - Question ouverte

Factor
x2+19x+90

Slide 15 - Diapositive

Factor
x2+6x7
timer
1:00

Slide 16 - Question ouverte

Factor
x2+6x7

Slide 17 - Diapositive

Solving trinomials:
x2+9x+20=0

Slide 18 - Diapositive

Solving trinomials:
x2+9x+20=0
(x+4)(x+5)=0

Slide 19 - Diapositive

Solving trinomials:


        or                                                                                        
                                                                            
x2+9x+20=0
(x+4)(x+5)=0
x+4=0
x+5=0

Slide 20 - Diapositive

Solving trinomials:


        or                                                                                        
or                                                                                      
x2+9x+20=0
(x+4)(x+5)=0
x+4=0
x+5=0
x=4
x=5

Slide 21 - Diapositive

13.3 Factoring trinomials
Solving a trinomial using the product-sum method:
Example, solve:
Step 1: Factorize
Step 2: Make equations                                                     or
Step 3: Solve the equations                                       or
                                                                                          
x2+9x+20=0
(x+4)(x+5)=0
x+4=0
x+5=0
x=4
x=5

Slide 22 - Diapositive

Bettermarks
  • Work on 13.3
  • Until the end of the lesson
  • Raise your finger if you have any questions or when you're finished
  • Communicate in English please

Slide 23 - Diapositive