# 2TH §5.5 Quadratic equations

§ 5.5 Quadratic equations
Time for a whole lotta math!

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Slide 1: Slide
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 25 slides, with text slides.

Lesson duration is: 50 min

## Items in this lesson

§ 5.5 Quadratic equations
Time for a whole lotta math!

#### Slide 1 -Slide

Discussing exercises
20cd, 22def

#### Slide 3 -Slide

22def
Write as short as possible

You will learn

#### Slide 8 -Slide

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

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0:45

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0:25

#### Slide 13 -Slide

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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0:30
x2=0

#### Slide 14 -Slide

That solution is:  x = 0

#### Slide 15 -Slide

Realise that we talk about
point(s) at the height of -1,
so 1 grid below the x axis!
Is the graph that low?!
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1:00

#### Slide 17 -Slide

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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1:00
x2=25

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1:00

#### Slide 19 -Slide

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

You can also solve QUADRATIC equations with cards!

#### Slide 20 -Slide

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 22 -Slide

Solutions should always be exact!
(Not rounded off )