# 2Tvwo §5.5 Quadratic equations - the start

Time for a whole lotta math!

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Slide 1: Tekstslide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 21 slides, met tekstslides. Lesduur is: 50 min

## Onderdelen in deze les

Time for a whole lotta math!

#### Slide 2 -Tekstslide

Note how smoothly we will go from
- graphs with their points of intersection to
- how to solve them!

#### Slide 3 -Tekstslide

This exercise we will do now.
So OPEN your NOTEBOOK and take a PEN.

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#### Slide 8 -Tekstslide

Realise that we now talk about the
point(s) that lie on the x axis!
Only there it is true that:

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x2=0

#### Slide 9 -Tekstslide

That solution is:  x = 0

#### Slide 10 -Tekstslide

point(s) at the height of -1,
so 1 grid below the x axis!
Is the graph that low?!
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#### Slide 12 -Tekstslide

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!
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x2=25

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#### Slide 15 -Tekstslide

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

You can also solve QUADRATIC equations with cards!

#### Slide 16 -Tekstslide

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!

#### Slide 18 -Tekstslide

Solutions should always be exact!
(Not rounded off )