# 2TH §4.6 Test Preparation

CH4 Roots
Summary
1 / 16
Slide 1: Tekstslide
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In deze les zitten 16 slides, met interactieve quizzen en tekstslides.

Lesduur is: 50 min

## Onderdelen in deze les

CH4 Roots
Summary

#### Slide 1 -Tekstslide

Roots
You know what a square root is.

The square root of 25 is 5 because 5 x 5 = 25.
You cannot take the square root of a negative number.

#### Slide 2 -Tekstslide

You can only add and subtract roots with the same number underneath the square root sign. This works the same way as adding and subtracting like terms.

#### Slide 3 -Tekstslide

Write as short as possible

P=15a+6b+5a2b
A
P=20a+8b
B
P=24ab
C
P=20a+4b
D
cannot be written any shorter

#### Slide 4 -Quizvraag

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 5 -Quizvraag

Multiplying square roots
We've seen that
because:
area of the square =               x            =               = 5

As a rule we say:
5
5
25

#### Slide 6 -Tekstslide

Multiplying square roots
When multiplying square roots, you use the rule
If there are numbers in front of the square roots, you multiply those by each other.

#### Slide 7 -Tekstslide

What's under the chocolate milk?

#### Slide 8 -Open vraag

Write as short as possible
A
632
B
364
C
24
D
cannot be written shorter

#### Slide 9 -Quizvraag

Write as a single square root
You can write numbers as a single square root.
This makes it easier to compare numbers.

#### Slide 10 -Tekstslide

Simplify square roots
When you simplify a square root, you rewrite the root so you get the smallest possible whole number underneat the root sign.

#### Slide 11 -Tekstslide

Simplify if possible

A
2180
B
1210
C
12
D
cannot be simplified

Solution

#### Slide 13 -Tekstslide

Exact or Approximation
When asked for an exact answer, you give your answer as a square root (or a whole number if the square root is a whole number).
When asked for an approximation you type the square root in your calculator and round off the result.

Test Preparation