2-1 Parabolas

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

Parabolas (p 36)

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Stationary

- Writing book

- Pen, pencil

- Calculator

- iPad

Report

- NO

Lessonup

- Yes

Bags in

the cuboard

Phones in the phone bag

• Determine the factor when there is exponential growth.
• Determine the formula if you have the table for exponential growth between two variables.

• State what the general shape of a parabola will be.
• Explain what a vertex an an axis of symmetry is.
• Simply formulas with brackets.

Try this to refresh your memory...

NOT

IA

Solution Q1

IA

3a

1. upward opening
2. downward opening

3b

1. positive
2. negative

3c

1. positive
2. negative

3e

1. y=−x​2​​+1
2. y=−x​2​​+2
3. y=x​2​​−1
4. y=x​2​​+2

Solution Q3

IA

4a

1. upward
2. downward

4b

1. upward
2. downward

4c

1. upward
2. downward

4d

1. upward
2. downward

Solution Q4

NOT

IA

Solution Q6

IA

8a

1. y=2x​2​​−2x+4up
2. y=−2x​2​​−3x+4down
3. y=2x​2​​−3x+4up
4. y=−2x​2​​−2x+4down

8b

1. y=5x​2​​+35x−60up
2. y=−5x​2​​+35x−60down
3. y=5x​2​​−7x+12up
4. y=−5x​2​​−7x+12down

8c

1. y=x​2​​−5x−14up
2. y=x​2​​−5x−14down
3. y=x​2​​−9x−7up
4. y=x​2​​−9x−7down

Solution Q8

NOT

IA

Solution Q9

      Conclusion:

              - Axis of symmetry

- Upward opening or downward 

opening parabola; 

- Vertex

- Solving brackets: 

              using the table

Try on your own

1, 2, 5 and 7

TRY ON YOUR OWN

2; 5; 7 (p. 36)

RULES:

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

Extra excercise:  (p. 54)

Challenge:  (p. 56)