# 1819 C2X §11.3

Which exercises/theories shall we discuss on the board?
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Slide 1: Woordweb
WiskundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 11 slides, met interactieve quizzen en tekstslides. Lesduur is: 50 min

## Onderdelen in deze les

Which exercises/theories shall we discuss on the board?

#### Slide 1 -Woordweb

Recap: Binomials and Trinomials
A formula like                                 is called a binomial
(bi = 2, the formula has 2 terms)

A formula like                                           is called a trinomial
(tri = 3, the formula has 3 terms)
y=3x2+6x
y=x2+7x+10

#### Slide 2 -Tekstslide

Removing double brackets

#### Slide 3 -Tekstslide

Factorising trinomials
What do you notice?

#### Slide 4 -Tekstslide

Factorising trinomials
If a trinomial is of the form
(so 1 in front of x-squared, a number in front of x and a single number)
then you can factorise the formula with double brackets

For the numbers on the dots you should find two numbers so that:
.... + .... = b                  the sum of the two numbers in the number in front of x
.... x .... = c                   the product of the two numbers is the single number
y=x2+bx+c
y=(x+...)(x+...)

#### Slide 5 -Tekstslide

Factorising trinomials
Factorise
Make a multiplication table.

We need two numbers on the dots
... + ... = 8
... x ... = 12
y=x2+8x+12

#### Slide 6 -Tekstslide

Factorising trinomials
Factorise
Make a multiplication table.

We need two numbers on the dots
2 + 6 = 8
2 x 6 = 12
So the factorised formula is
y=x2+8x+12
y=(x+2)(x+6)

#### Slide 7 -Tekstslide

Try it out
(take a photo of your notebook or make a screenshot)
Factorise
Make a multiplication table.

We need two numbers on the dots
... + ... = ...
... x ... = ...
So the factorised formula is
y=x2+3x18

Factorise

y=x2+3x18

#### Slide 9 -Open vraag

Try it out
(take a photo of your notebook or make a screenshot)
Factorise
Make a multiplication table.

We need two numbers on the dots
6 + -3 = 3
6 x -3 = 18
So the factorised formula is
y=x2+3x18
y=(x3)(x+6)

#### Slide 10 -Tekstslide

HW Monday
Make and correct §11.3