2-5 Three forms of quadratic formulas

• Wiskunde
• Middelbare school
• havo
• Leerjaar 3

2-5 Three forms of 

quadratic formulas (p. 44)

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

Determine the shape of the graph of parabolas that are not written in the conventional 

way, but in a different way.

y=ax​2​​+bx+c

32 (p44)

IA

32 a

1. Up, just as wide
2. Up, wider
3. Down, just as wide
4. Down, wider

32 b

1. Up, narrower
2. Up, wider
3. Down, narrower
4. Down, wider

32 c

1. Up, narrower
2. Up, wider
3. Down, narrower
4. Down, wider

32 d

1. Up, narrower
2. Up, wider
3. Down, narrower
4. Down, wider

32 (p44)

32 (p44)

32 (p44)

32 (p44)

33 (p 44)

NIA

33 (p 44)

IA

38a

1. 1
2. 2
3. 3
4. 4

38b

1. 1
2. 2
3. 3
4. 4

38c

1. 1
2. 2
3. 3
4. 4

38d

1. 1
2. 2
3. 3
4. 4

IA

Conclusion:

- Formulas in the shape of                                                      and 

  can be written in the form             

  by removing the brackets.

- For a quadratic formula in the form

  the intersections with the x-axis are (s,0) and (t,0)

-For quadratic formulas in the form

  the vertex is (p,q)

y=ax​2​​+bx+c

y=a(x−s)(x−t)

y=a(x−p)​2​​+q

y=a(x−p)​2​​+q

y=a(x−s)(x−t)

Try on your own

1, 2, 5 and 7

TRY ON YOUR OWN

34, 35, 37 (p. 45)

RULES:

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

Extra excercise: ... (p. ...)

Challenge: ... (p. ...)