2TH §5.5 Quadratic equations

§ 5.5 Quadratic equations
Time for a whole lotta math!

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WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 25 slides, with text slides.

time-iconLesson duration is: 50 min

Items in this lesson

§ 5.5 Quadratic equations
Time for a whole lotta math!

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Discussing exercises
20cd, 22def

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22def
Write as short as possible

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You will learn

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

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The answer:

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0:25

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The answer is:

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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

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The answer is:


That solution is:  x = 0

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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

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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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The answer is:


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




You can also solve QUADRATIC equations with cards!

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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!

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Solving quadratic equations

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Solving (quadratic) equations





Solutions should always be exact!
(Not rounded off )

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Solving (quadratic) equations

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Homework time
Do §5.5 Quadratic equations:  32 until 35
Check your answers with the solutions book!


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15:00

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