# 5.2 and 5.3

How do we call this kind
of graphs?
1 / 11
Slide 1: Open vraag
WiskundeMiddelbare schoolvwoLeerjaar 3

In deze les zitten 11 slides, met interactieve quizzen en tekstslides.

Lesduur is: 45 min

## Onderdelen in deze les

How do we call this kind
of graphs?

#### Slide 1 -Open vraag

Do you remember the three words which belong to these kind of graphs.

#### Slide 2 -Woordweb

Moving vertically
-> a fixed number is added to/subtracted from all the function values.

#### Slide 3 -Tekstslide

Moving vertically
• In a table: add or subtract the fixed number to all the outcomes (y)
• In a formula: add or subtract the fixed number to the formula
• In a graph: the graph will move up or down, the shape won't change.

#### Slide 4 -Tekstslide

y = -x² + 5x - 6
y = ½x + 1
y = -x² + 5x - 9
y = 2x² + 8x + 4½
y = ½x + 2½
y = 2x² + 8x + 2½

#### Slide 5 -Sleepvraag

Stretched parallel to the y-axis
-> all the function values are multiplied by the same factor.

#### Slide 7 -Tekstslide

Stretched parallel to the y-axis
• In a table: multiply all the outcomes (y) with the same factor
• In a formula: multiply the whole formula with the same factor
• In a graph: the graph will stretch vertically. The points of intersection of the graph with the x-axis do not change!

#### Slide 8 -Tekstslide

The graph of f is stretched
parallel to the y-axis by a
factor of 2.
What is the new formula?
f(x)=x2+4x2
A
g(x) = -x² + 4x
B
g(x) = -2x² + 8x - 4
C
g(x) = -2x² + 4x - 2
D
g(x) = -2x² + 8x - 2

#### Slide 9 -Quizvraag

This blue graph is stretched parallel
to the y-axis. The result is the red graph.
Vertex was (-2 , -10) and is now (-2 , -5).
Can you tell what the factor is?

A
0.5
B
2
C
5
D
-5

#### Slide 10 -Quizvraag

Homework
do ex. 15, 16, 17, 18, 19
(or 15, 16, 18, 19, C3)
of chapter 5