# Ch 9 :Refresh

what will we learn in this chapter

In this chapter you will learn about:
• square root functions
• fractional functions
• power functions
• rules for calculating with square roots, powers and fractions.
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Slide 1: Slide
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This lesson contains 13 slides, with text slides.

Lesson duration is: 30 min

## Items in this lesson

what will we learn in this chapter

In this chapter you will learn about:
• square root functions
• fractional functions
• power functions
• rules for calculating with square roots, powers and fractions.

#### Slide 1 -Slide

Before we start
Before we start you need to refresh your knowledge of the following:
• directly proportional
• rules for calculating with exponents
• Multiplying square roots

#### Slide 2 -Slide

Directly proportional
The formula for a directly proportional relation is written as
Y = ax
which is a linear formula with y-intercept equal to zero
(in other words it is a straight line through the origin)

do exercise R1

#### Slide 3 -Slide

Calculating with exponents
Read the theory on page 52 and look at the examples

do exercise R2

do exercise R3

#### Slide 7 -Slide

Multiplying square roots

do exercise R4

#### Slide 8 -Slide

Fractions
You can add or subtract: have to have same denominator
or
you can multiply

#### Slide 11 -Slide

Fractions
Practise by doing exercises R5 and R6

#### Slide 12 -Slide

Finally

Remember to check your answers and correct with a different coloured pen