5.2 The quadratic formula jko

5-2 Using the quadratic formula

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


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Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 3

This lesson contains 22 slides, with interactive quizzes, text slides and 1 video.

time-iconLesson duration is: 50 min

Items in this lesson

5-2 Using the quadratic formula

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


Slide 1 - Slide

                         Lesson goals
Use the quadratic equation to solve equations.

Slide 2 - Slide

What if factorisation doesn't work

Slide 3 - Slide

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

Slide 4 - Slide

So actually the quadratic equation is



but to simplify the calculation we use D

Slide 5 - Slide

Slide 6 - Slide

Slide 7 - Slide

Slide 8 - Slide


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 9 - Quiz


x25x+3
Calculate the Discriminant
Discriminant=b24ac
A
-7
B
13
C
21
D
37

Slide 10 - Quiz


x25x+3
Solve the equation
x1=2a(b+D)
x2=2a(bD)
A
x=4,3 or x=-0,7
B
x=4,3 or x=0,7
C
x=-4,3 or x=0,7
D
x=-4,3 or x=-0,7

Slide 11 - Quiz

Slide 12 - Slide

Slide 13 - Slide


A
-1
B
1

Slide 14 - Quiz


x24x+12
Calculate D
A
-32
B
32
C
60
D
64

Slide 15 - Quiz


x24x+12
Solve the equation
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 16 - Quiz

Slide 17 - Slide

Slide 18 - Slide

Slide 19 - Slide

Slide 20 - Slide

Try on your own
1, 2, 5 and 7
RULES:
  • In your writingbook
  • Start with writing down the letters. Start with D, a,b,c,



Extra excercise: Bettermarks
Challenge: Do both!
HW - Chapter 5: 10-15 

Slide 21 - Slide

Slide 22 - Video