1TTO §9.5 Powers of negative numbers PTI


To understand §9.5 better, we first shortly look back at Ch 8!
Powers are explained in a basic way, there.
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To understand §9.5 better, we first shortly look back at Ch 8!
Powers are explained in a basic way, there.

Slide 1 - Diapositive

Slide 2 - Diapositive

Slide 3 - Diapositive

Task 1:



Key in your answer in the next slide!

Slide 4 - Diapositive

Who's right?
Paulo says: 9
Sabine says: -9
A
Paulo: Sabine
B
both
C
Paulo
D
neither

Slide 5 - Quiz

explanation:

Slide 6 - Diapositive

Task 2:
-           = 25    (A)
-           = - 25   (B)
-           = 10     ( C )
-           = - 10     (D)    Fill in the good answer in the next slide.
52
52
52
52

Slide 7 - Diapositive

minus five squared equals ......

52
A
25
B
- 25
C
10
D
- 10

Slide 8 - Quiz

explanation:

-         =    -  5 x 5 = - 25
So the key to the answer is that only 5 is squared, but not
the minus sign!!
52

Slide 9 - Diapositive

A popular type of question now:
a Fotovraag!
Take your pen, pencil and eraser out of your pencil case and 
open your Notebook, please.

Slide 10 - Diapositive

Task 3:
1. 


2. Take a picture and send it in in the next side!
3. This is a task for ALL of you.

Slide 11 - Diapositive

Task 3.
everybody's Calculations:

Slide 12 - Question ouverte

Solution task 3:
-10 x               = 
-10 x( -8 x -8) 
= -10 x       64 = -640
(8)2

Slide 13 - Diapositive

After all this squaring ......

+ we'll deal with higher powers too!

Slide 14 - Diapositive

Task 4:
=  .....

Fill in your answer in the next slide, again.
(4)3

Slide 15 - Diapositive

task 4:
A
64
B
-64
C
-12
D
12

Slide 16 - Quiz

Explanation Task 4:
=  -4 x -4 x -4 = -64
(4)3

Slide 17 - Diapositive

Task 5: 
in the same way do:
=  ............
43

Slide 18 - Diapositive

Task 5:
A
-64
B
-12
C
12
D
64

Slide 19 - Quiz

Explanation Task 5: 

=        -   4 x 4 x 4 = -64
So, do               and             
give the same outcome?!
Indeed, they do!!        
43
(4)3
43

Slide 20 - Diapositive

Slide 21 - Diapositive

TASK 6:
one more Fotovraag!



MAKE THIS ONE IN YOUR NOTEBOOK
TAKE A PICTURE AND SEND IT IN IN NEXT SLIDE
MAKE YOUR TEACHER PROUD AND YOURSELF TOO!

Slide 22 - Diapositive

TASK 6:

Slide 23 - Question ouverte

EXPLANATION TASK 6:

Slide 24 - Diapositive

HOMEWORK TIME
Now make §9.5:
exercises   43  t/m  47.
One final remark about 46 and 47 in next slide.

Slide 25 - Diapositive


As you can see, for 46 and 47 the CALCULATIONS are of the greatest importance!
So, when making them, don't just give the answers but show 
all the steps it takes, to get the answer!

Slide 26 - Diapositive

Time for homework

Slide 27 - Diapositive