2TH Ch 11 Refresh

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 2

Planning Chapter 11

chapter 11 is called:

factorising

Refresh

Before you do the Refresh paragraph R3 until R9 on p.168/169,

let's have a Recap on the exercises.

It is about:

- removing brackets (from Ch 9, that you recently worked on) and

- solving equations (which you practiced longer ago!)

Removing single brackets

Write y = 2t(5t - 3) without brackets.

            

Removing double brackets

 y = (2n - 7)(n + 1)

                                  

Next is ...

Solving equations.

Linear equations like:   24 = 2c + 8  you know from Ch9.

However Quadratic Equations like:

you studied much longer ago. This comes now!

The KEYWORD for Solving it is: CARD METHOD 

4x​2​​+8=44

Solving (quadratic) equations

Next task ...

1. Copy the task

2. Solve it by the Card Method

3. Send it in!

4. REMEMBER: there are TWO Solutions!

Solve:

x​2​​+2=7

1. x​2​​=5
2. x=−√​5​​​
3. x=√​5​​​
4. x=√​5​​​or−√​5​​​

SOLVE:             +2 = 7.  

           = 5

x =              or       x =       

x​2​​

x​2​​

√​5​​​

−√​5​​​

Shorten if possible:
3s + 6

1. 9s
2. 18s
3. not possible

Shorten if possible:
5c x 6c = ....

1. 11c
2. 30c​2​​
3. 30c
4. not possible

Solving (quadratic) equations

Solutions should always be exact!

(Not a rounded off approximation)

Homework time

- Chapter 11  Do the Refresh exercises 3 until 9 (skip R6)

- upload your CORRECTED Solutions in Classroom