3Tvwo § 4.3 The quadratic formula

8-2 Using the quadratic formula

What you need: - Textbook, writingbook, iPad - Pen, pencil, geotriangle - Calculator


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Slide 1: Tekstslide
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In deze les zitten 29 slides, met interactieve quizzen, tekstslides en 1 video.

time-iconLesduur is: 50 min

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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 - Tekstslide

                         Lesson goals
1. Learn the quadratic formula.
2. Use this to solve quadratic equations.

Slide 2 - Tekstslide

What if factorisation doesn't work

Slide 3 - Tekstslide

You use the quadratic eqution
First write the equation in the standard form...

Slide 4 - Tekstslide

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 - Tekstslide

So actually the quadratic equation is



but to simplify the calculation we use D

Slide 6 - Tekstslide

Slide 7 - Video

ATTENTION!
Once more:
COPY  slide number 6 in your NOTEBOOK!
You will need this very soon.

Slide 8 - Tekstslide

Do you have no clue what to do, yet?

Don't worry, let's do one together.

Next slide, please!

Slide 9 - Tekstslide

Slide 10 - Tekstslide

timer
5:00

Slide 11 - Tekstslide

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 - Tekstslide

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 - Quizvraag

12b
A
-7
B
13
C
21
D
37

Slide 14 - Quizvraag

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 - Quizvraag

Slide 16 - Tekstslide

timer
5:00

Slide 17 - Tekstslide

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 - Tekstslide

13a
A
-1
B
1

Slide 19 - Quizvraag

13b
A
-32
B
32
C
60
D
64

Slide 20 - Quizvraag

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 - Quizvraag

Slide 22 - Tekstslide

timer
15:00

Slide 23 - Tekstslide

Slide 24 - Tekstslide

Slide 25 - Tekstslide

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 - Tekstslide

Slide 27 - Tekstslide

Slide 28 - Tekstslide

Slide 29 - Tekstslide