8-3 Using the discriminant

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

8-3 Using the discriminant

What you need: - Textbook, writingbook, iPad - Pen, pencil, geotriangle - Calculator

Schoolbags in the cuboard

Phones in the phonebag

Bluetooth 

- ON

- VPN off

                         Lesson goals

• Using the discriminant to see if the equation can be solved...
  
• and if it can be solved, determine how many solutions are there
  

19a

1. no solution
2. 1
3. 2

19b

1. no solution
2. 1
3. 2

19c

1. no solution
2. 1
3. 2

19d

1. no solution
2. 1
3. 2

21a

1. r=-1 of r=-7
2. r=-1 of r=7
3. r=1 of r=-7
4. r=1 of r=7

21b

1. x=1 of x=0,4
2. x=-1 of x=0,4
3. x=1 of x=-0,4
4. x=-1 of x=-0,4

21c

1. k=1 of k=3
2. k=-1 of k=3
3. k=1 of k=-3
4. k=-1 of k=-3

21d

1. n=4 or n=2
2. n=4 or n=-2
3. n=-4 or n=2
4. n=-4 or n=-2

Try on your own

1, 2, 5 and 7

RULES:

• In your writingbook
• Use: Textbook
• Discussion when you are stuck is allowed

Extra excercise: 18

Challenge: 24

Now try: 20, 22, 23