2Tvwo §5.5 Quadratic equations - the start

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

§ 5.5 Quadratic equations

Time for a whole lotta math!

Note how smoothly we will go from

- graphs with their points of intersection to

- quadratic equations and 

- how to solve them!

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 t/m 35 only!

The point is that it is important that you practise

what you've learnt in this LessonUp in a good way.

The rest of the paragraph comes next lesson!