Quadratic formulas (t1b)

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 1

Quadratic formulas

February 10th

t1b

14:30

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Schedule

• Homework                                                      10 min
• Review: square (roots)                              10 min
    Quizzes
• Quadratic formulas                                    10 min
    Quizzes
• Silent practice                                              25 min
• Discuss quiz                                                  20 min

a)5​2​​+3​2​​=

1. 8
2. 16
3. 34
4. 64

b)(−6)​2​​−(−4)​2​​=

1. -56
2. -20
3. 2
4. 20

c)√​121​​​−5⋅√​​3​​27​​​​​+3​2​​=

1. -49
2. 5
3. 27
4. 85

a)5​2​​+3​2​​=

b)(−6)​2​​−(−4)​2​​=

c)√​121​​​−5⋅√​​3​​27​​​​​+3​2​​=

Fill in three words (or sentences) related to formulas

Quadratic formulas

'Linear' formulas                                                    

Cost = 4 ⋅ number of kilometres + 3

Quadratic formulas

'Linear' formulas                                           

C=4k+3

Quadratic formulas

'Linear' formulas                                           

y=4x+3

Quadratic formulas

'Linear' formulas                                                       'Quadratic' formulas

----------------

y=4x+3

y=​2​​1​​x−2

2

Quadratic formulas

'Linear' formulas                                                       'Quadratic' formulas

----------------

y=4x+3

y=​2​​1​​x−2

2

OK, quadratic formulas and parabolas...
...but no one uses this in real life!

Agree

Disagree

'Linear' formulas

'Quadratic' formulas

Drag every formula to the correct side.

y = x2 - 3

N = 2k + 6

B = 5 - 3t

K = 7x + 62

A = 9 - 2h2

Filling in a quadratic formula

Given is the formula

What is y for x = 2?

What is y for x = -3?

y=​2​​1​​x​2​​−2

Given is the formula

What is y for x = 3 ?

y=2x​2​​−1

1. 5
2. 7
3. 19
4. 17

Given is the formula

What is y for x = -4 ?

y=2x​2​​−1

1. -31
2. -33
3. 31
4. 33

y=2x​2​​−1

x=3

x=−4

Silent practice

No questions! :(

Read carefully   -   study theory/examples   -   look in solutions

Basic route

22, 23, 25, 26, 28, 29

Advanced route

18, 20, 25, 27, 29

Quiz!