2TH §5.5 Quadratic equations

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 2

§ 5.5 Quadratic equations

Time for a whole lotta math!

Discussing exercises

20cd, 22def

22def

Write as short as possible

You will learn

This exercise we will do now.

So OPEN your NOTEBOOK and take a PEN.

The answer:

The answer is:

Realise that we now talk about the

point(s) that lie on the x axis!

Only there it is true that:

x​2​​=0

The answer is:

That solution is:  x = 0

Realise that we talk about 

point(s) at the height of -1,

so 1 grid below the x axis!

Is the graph that low?!

You cannot see y = 25 on the vertical

axis, because it only goes up to 5.

Still you can answer this question!

Because the formula    (                      )

 helps you out!

x​2​​=25

The answer is:

Solving quadratic equations

In year 1 you learned how to solve LINEAR equations using cards.

You can also solve QUADRATIC equations with cards!

Solving (quadratic) equations

1) Place a card on the term that contains the variable

2) Work out what should be written on the card

3) Repeat if needed, until you find the value of the variable

Quadratic equations often have 2 solutions, or sometimes there is no solution!

Solving quadratic equations

Solving (quadratic) equations

Solutions should always be exact!

(Not rounded off )

Solving (quadratic) equations

Homework time

Do §5.5 Quadratic equations:  32 until 35

Check your answers with the solutions book!