# 1718 WB1Z CH12 Lesson 6

Which exercises/theory should we discuss?
1 / 14
Slide 1: Woordweb
WiskundeMiddelbare schoolvwoLeerjaar 1

In deze les zitten 14 slides, met interactieve quizzen en tekstslides.

Lesduur is: 50 min

## Onderdelen in deze les

Which exercises/theory should we discuss?

#### Slide 1 -Woordweb

What is the opposite number of -7?

#### Slide 2 -Open vraag

Recap: Opposite numbers
Opposite numbers are numbers that are the same distance away from zero, but on the other side of zero.

-3 and 3 are opposite numbers                  -0.8 and 0.8 are opposite numbers

#### Slide 3 -Tekstslide

What is the square of 4?

#### Slide 4 -Open vraag

Recap: Squaring
When you square a number, you multiply the number with itself.

#### Slide 5 -Tekstslide

Squaring and negative numbers
If you calculate the square of 3, you calculate 3 x 3 = 9
Notation:

If you calculate the square of -3, you calculate -3 x -3 = 9
Notation:                                                Use brackets!

The number                is the opposite of           and is therefore equal to -9
Notation:                                                    No brackets means opposite number!

Calculate:

(5)2
A
10
B
-10
C
25
D
-25

Calculate:

62
A
12
B
-12
C
36
D
-36

#### Slide 8 -Quizvraag

Calculate the square of -8
A
8
B
16
C
64
D
-64

#### Slide 9 -Quizvraag

Formulas that contain the square of a variable are called quadratic formulas.

Example:

#### Slide 10 -Tekstslide

Plotting a parabola
The graph of a quadratic formula is called a parabola.
If you want to plot a parabola, make a table first!

#### Slide 11 -Tekstslide

Plotting a parabola

Use brackets
when filling in
negative numbers!

#### Slide 12 -Tekstslide

Plotting a parabola

#### Slide 13 -Tekstslide

Homework Monday
Make and correct:
30 - 39