2TTO §11.4 AxB=0 PTI

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

§11.4 A x B = 0

All the 'factorising', done in paragraphs 1, 2 and 3,

will be used several times again.

So you see that a chapter is not a bunch of loose items!

Recap on §11.2 and §11.3

To work your way much easier through §11.3,

first we look back shortly.

Task 1:

+ Open your Notebook and Textbook on p.178/179:     §11.4 A x B = 0

+ Watch the equations from exercise 28

+ Compare them to those of exercise 35, p.183!

+ Key in your answer shortly in the next slide.

Main difference between equations from 28 and 35 is:
.............................

Solution task 1:

+ The equations from 28 all end with:  ................. = 0

+ The equations from 35 don't end with .............. = 0.

This means that the equations from §11.4, today's paragraph, are easier to solve. Just watch the next slide for an example!

Task 2:

Solve the equation below and key in your answers in the next slide.

(2m -4)(m+7) = 0 My answer is:
A. 0 and -7 B. 2 and -7
C. 0 and 2 D. -2 and 7

1. 0 and -7
2. 2 and -7
3. 0 and 2
4. -2 and 7

(Task and) Solution:

Now a connection will be made between:

1st:       solving quadratic equations, and

2nd:     graphs for quadratic formulas, so parabolas!

By doing 30 together, you will learn to do the 2nd half of the paragraph.

TASK 3:

Solution TASK 3: 

TASK 4:

Solution:

In the next slide, this equation will be solved.

TASK 5:

SOLUTION:

TASK 5:

SOLUTION:

TASK 5:        

SOLUTION on the right: 

(Do you remember that we found

the same outcome with the graph?)

Next comes

a bit of Theory,

summarising all this!  

This is a Photo question!

+ Make 31 a in your Notebook

+ Make a picture of your work

+ Send it in, in the next slide and

+ We get a collection of your Solutions!

Send in your picture of 31a:

Solution TASK 6:

x​2​​+3x−18=0

(x+6)(x−3)=0

X+6=0

x−3=0

x=−6

x=3

x+6=0

Homework time

Make:      §11.4    A x B = 0