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3Tvwo § 4.3 The quadratic formula
8-2 Using the quadratic formula
What you need:
- Textbook, writingbook, iPad - Pen, pencil, geotriangle - Calculator
Schoolbags
in the cuboard
Phones
in the phonebag
Bluetooth
- ON
- VPN off
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Slide 1:
Diapositive
Wiskunde
Middelbare school
havo
Leerjaar 3
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8-2 Using the quadratic formula
What you need:
- Textbook, writingbook, iPad - Pen, pencil, geotriangle - Calculator
Schoolbags
in the cuboard
Phones
in the phonebag
Bluetooth
- ON
- VPN off
Slide 1 - Diapositive
Lesson goals
1. Learn the quadratic formula.
2. Use this to solve quadratic equations.
Slide 2 - Diapositive
What if factorisation doesn't work
Slide 3 - Diapositive
You use the quadratic eqution
First write the equation in the standard form...
Slide 4 - Diapositive
ATTENTION!
COPY on a new page in your NOTEBOOK
the content of the previous slide.
Write it clear and neatly, because you will use this for the coming exercises in this LESSON UP!
Slide 5 - Diapositive
So actually the quadratic equation is
but to simplify the calculation we use
D
Slide 6 - Diapositive
Slide 7 - Vidéo
ATTENTION!
Once more:
COPY slide number 6 in your NOTEBOOK!
You will need this very soon.
Slide 8 - Diapositive
Do you have no clue what to do, yet?
Don't worry, let's do one together.
Next slide, please!
Slide 9 - Diapositive
Slide 10 - Diapositive
timer
5:00
Slide 11 - Diapositive
Attention for 12c:
1.Do not round your answers.
Give the answers as ROOTS !!
2. Sit on your own. You only learn it by doing it yourself!
Slide 12 - Diapositive
12a
A
a=1 b=5 c=3
B
a=3 b=-5 c=1
C
a=1 b=-5 c=3
D
a=3 b=5 c=1
Slide 13 - Quiz
12b
A
-7
B
13
C
21
D
37
Slide 14 - Quiz
12c
A
x=(5 + root13):2 or x=(5- root13) : 2
B
x= 5 + root 13 :2 or x= 5 - root 13 :2
C
x= 4,3 or x=0,7
D
x=-4,3 or x=-0,7
Slide 15 - Quiz
Slide 16 - Diapositive
timer
5:00
Slide 17 - Diapositive
One useful TIP:
If the ROOT in your answer comes out, then write down the result.
So change ROOT 64 into 8, ROOT 81 into 9, etcetera.
Slide 18 - Diapositive
13a
A
-1
B
1
Slide 19 - Quiz
13b
A
-32
B
32
C
60
D
64
Slide 20 - Quiz
13c
A
x=6 or x=2
B
x=-6 or x=2
C
x=6 or x=-2
D
x=-6 or x=-2
Slide 21 - Quiz
Slide 22 - Diapositive
timer
15:00
Slide 23 - Diapositive
Slide 24 - Diapositive
Slide 25 - Diapositive
Try on your own
1, 2, 5 and 7
RULES:
In your writingbook
Use: Textbook
Discussion when you are stuck is allowed
Extra excercise: none
Challenge: 16
HW - correct your mistakes
Slide 26 - Diapositive
Slide 27 - Diapositive
Slide 28 - Diapositive
Slide 29 - Diapositive
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