Ch 9 :Refresh

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 3

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.

Before we start

Before we start you need to refresh your knowledge of the following:

• directly proportional
• rules for calculating with exponents
• adding/subtracting square roots
• Multiplying square roots
• Adding/subtracting and multiplying fractions

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

Calculating with exponents

Read the theory on page 52 and look at the examples

do exercise R2

Adding and subtracting square roots

do exercise R3

Multiplying square roots

do exercise R4

Fractions

You can add or subtract: have to have same denominator

or 

you can multiply

Fractions

Practise by doing exercises R5 and R6

Finally

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