3THavo §7.1 Quadratic formulas 1-5

Today's Homework is
§ 7.1 Quadratic formulas, 1-5
But first,

  See next slide!
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WiskundeMiddelbare schoolhavoLeerjaar 3

This lesson contains 16 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Today's Homework is
§ 7.1 Quadratic formulas, 1-5
But first,

  See next slide!

Slide 1 - Slide

Mistake in Solutionsbook p.208:
This is about the REFRESH:
The words 'The y-intercept'
 should
 be:
'The gradient' !    
So the question in R3, p.244  should've been
'Give the gradient',  too!   Please correct this with a pencil!        

Slide 2 - Slide

Who discovered this mistake?

Slide 3 - Mind map

Calculate in your head:
y = x2 + 6x     
for x = -3       

Slide 4 - Slide

y = .....

Slide 5 - Mind map

Explanation:

y = (-3)2 + 6 x -3 = 9  + -18 = -9
TIPS:
1. when you square a negative number the outcome is positive!
2. Use brackets around -3 !

Slide 6 - Slide

We do exercise 2a together:
+ All take p.246, exercise 2a before you.
+ Who's going to read out aloud (not too loud...) the
first sentence and question a?
Fate, that is Lollipopsticks, decides!
+ Who's going to explain 2a? The oldest -and wisest?- one in class!

Slide 7 - Slide

Slide 8 - Slide

Time to do some Homework.
Work on § 7.1 for yourself.
Later in this lesson we will continue the LessonUp.

Slide 9 - Slide

New stuff - the right stuff...
Get ready!

Slide 10 - Slide

What's next?
The 'right stuff' from the last, somewhat mysterious  slide is about:
 a fine Method to find out 
+  if a Formula is about a Quadratic Relation,
+ by Investigating a Table...

Slide 11 - Slide

Slide 12 - Slide

Another Mistake in Solutionsbook:
                 p.211 exercise 5c:
Contrary to the book, that says there isn't,
there certainly is a Quadratic Relation between x and y.  Please:
             + correct this with a pencil and
             + try to find the calculating mistake the writer made (when you arrive                      at exercise 5c!)

Slide 13 - Slide

TIP for doing 4, 5 (,6 and 7c)
The Method you just learnt:
finding out wether a Formula shows a Quadratic Relation or not,
USE THIS when doing 4, 5  (,6 and 7c!) 

Slide 14 - Slide

Work on on the Homework.

Slide 15 - Slide

What did you learn this lesson?

Slide 16 - Mind map