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5.5
Tuesday 12 January
today:
- homework (25, 26, 27)
- par. 5.5 sum and difference functions
- new homework
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Wiskunde
Middelbare school
vwo
Leerjaar 3
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Tuesday 12 January
today:
- homework (25, 26, 27)
- par. 5.5 sum and difference functions
- new homework
Slide 1 - Diapositive
homework 25, 26, 27
questions?
ex. 27 together
Slide 2 - Diapositive
Read of the period.
A
0.2
B
0.8
C
4
D
8
Slide 3 - Quiz
What is the average
bloodpressure?
A
80
B
90
C
110
D
130
Slide 4 - Quiz
What is the amplitude?
Slide 5 - Question ouverte
Moved or stretched?
A
Moved
B
Stretched
Slide 6 - Quiz
Moved or stretched?
A
Moved
B
Stretched
Slide 7 - Quiz
5.5 sum/difference functions
We can make the
sum function
or the
difference function
of two given functions
sum function:
add
two functions
difference function:
subtract
two functions
Skill 5
Slide 8 - Diapositive
5.5 sum/difference functions
We can make the
sum function
or the
difference function
of two given functions
But why??
E.g. economics, physics
Slide 9 - Diapositive
And how?
Most easy way: use a diagram
(like you did in primary school (?))
24
21 +
45
f(x)
g(x) +
h(x)
Slide 10 - Diapositive
Exercise 29
f(x) = ½x + 2 g(x) = -x + 1
Write down the function s = f + g
f(x)
g(x) +
s(x)
f(x) = ½x + 2
g(x) = -x + 1 +
s(x) = -½x + 3
Slide 11 - Diapositive
f(x) = ½x + 2 g(x) = -x + 1
Write down the function s = f - g
A
s(x) = 1½x + 3
B
s(x) = -½x + 3
C
s(x) = 1½x + 1
D
s(x) = -½x + 1
Slide 12 - Quiz
f(x) = ½x + 2 g(x) = -x + 1
Write down the function s = g- f
A
s(x) = -1½x + 3
B
s(x) = -1½x - 1
C
s(x) = ½x - 1
D
s(x) = -½x - 1
Slide 13 - Quiz
Pay attention!
When you subtract 2 functions you have to subtract
the whole function
f(x) = ½x + 2 g(x) = -x + 1
f(x) - g(x) = ½x + 2 -
(-x + 1)
Slide 14 - Diapositive
Homework
Do ex. 30, 31 and 32 of chapter 5
For the drawing, you can use Desmos.
Slide 15 - Diapositive
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