# 1819 C2X §3.3

Which of these does not exist?
A
25
B
25
C
25
D
they all exist
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Slide 1: Quiz
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 10 slides, with interactive quizzes and text slides.

Lesson duration is: 50 min

## Items in this lesson

Which of these does not exist?
A
25
B
25
C
25
D
they all exist

#### Slide 1 -Quiz

Write as short as possible

y=3x62+6x22
A
y=9x42
B
y=9x82
C
y=3x+42
D
Cannot be written any shorter.

#### Slide 2 -Quiz

Calculate without a calculator

(7)2=

#### Slide 3 -Open question

Recap
- You cannot take the square root of a negative number

- You can only add and subtract square roots with the same number or variable underneath the square root sign.

- If you square a square root, you get the number underneath the square root sign (if the square root exists).

#### Slide 4 -Slide

Multiplying square roots
We've seen that

As a rule we say:

#### Slide 5 -Slide

Multiplying square roots
If you multiply different square roots, the following rule applies:
(if both square roots exist)

Examples:

#### Slide 6 -Slide

Multiplying square roots
If you multiply square root numbers, the following rule applies:
(if both square roots exist)
Examples:

#### Slide 7 -Slide

Calculation order
When doing calculations with square roots, the Order of Operations applies:
1) Brackets
2) Powers and Roots
3) Multiplication and Division from left to right
4) Adding and Subtracting from left to right
Example:

#### Slide 8 -Slide

Homework Tuesday
Make and correct §3.3 (support, standard or challenge)

#### Slide 9 -Slide

Which exercises/theories should I discuss on the board?