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**F. Everything Quadratics**

Math 20: Foundations FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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Getting Started String Art p.356

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What DO YOU Think? P.357

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1. What is a Quadratic? FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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1. What is a Quadratic? Quadratic Relation – A relation that can be written in the standard form𝑦=𝑎 𝑥 2 +𝑏𝑥+𝑐, where 𝑎≠0; for example, 𝑦=4 𝑥 2 +2𝑥+1 Parabola – The shape of the graph of any quadratic relation.

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Explore the Math p.359 Grab your graphing Calculators!! How does changing the coefficients and constant in a relation that is written in the form 𝑦=𝑎 𝑥 2 +𝑏𝑥+𝑐affect the graph of the relation?

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Summary p.359

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Practice Ex. 7.1 (p.360) #1-6

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**2. Properties of Quadratic Graphs**

FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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Reflections p.362

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**Vertex - The point at which the quadratic function reaches its maximum or minimum value.**

Axis of Symmetry - A line that separates a 2-D figure into two identical parts. For example, a parabola has a vertical axis of symmetry passing through its vertex.

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Example 1

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Example 2

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**Does this last Function have a max or min value?**

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Example 3

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Summary p.368

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Practice Ex. 7.2 (p.368) #1-16 #4-19

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**3. Graphing to Solve Quadratic Equations**

FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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**3. Graphing to Solve Quadratic Equations**

A zero is a number that when subbed in for the x variable it makes the equation equal to zero A zero is another name for an x-intercept

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Investigate the Math p.373

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Example 1

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Example 2

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**Is it possible for a Quad Equation to have more than 2 roots?**

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Example 3

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Summary p.379

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Practice Ex. 6.3 (p.379) #1-13 #5-15

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**4. Quadratics in Factored Form**

FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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Investigate the Math p.382

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To find your x-intercepts for your quadratic you can factor the function then set each part equal to zero and solve for x. You can then also average your x-intercepts together to get your axis of symmetry

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Example 1

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Example 2

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Example 3

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Example 4

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Summary p.390

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Practice Ex. 7.4 (p.391) #1-16 #4-20

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**5. Solving Quadratics by Factoring**

FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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**5. Solving Quadratics by Factoring**

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When you rewrite your Quadratic equation in Standard form (=0) you can factor the equation to easily find your zeros (x- intercepts)

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**How can you verify that your answers are correct?**

If I gave you the roots (x-intercepts) 2 and 6 can you give me the quadratic equation in standard form? Can all quadratic equations be solved by factoring?

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Example 1

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Example 2

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When your quadratic function is in factored from how can you tell how many roots there will be 2 or 1?

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Example 3

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Example 4

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Summary p.405

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Practice Ex. 7.5 (p.405) #1-15 #3-18

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6. Vertex Form FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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6. Vertex Form Vertex Form of a Quadratic Function 𝑦=𝑎 (𝑥−ℎ) 2 +𝑘

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Investigate the Math p.408 Read problem then go straight to the questions

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Example 1

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Example 2

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Example 3

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Example 4

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Summary p.416

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Practice Ex. 7.6 (p.417) #1-14 #4-19

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**7. The Quadratic Formula FM20.9**

Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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7. The Quadratic Formula When we want to solve a quadratic function, find the roots, zeros or x-intercepts but we can not factor the function we use the Quadratic Formula The Quadratic Formula solve for x when we can not factor

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Quadratic Formula: 𝑥= −𝑏± 𝑏 2 −4𝑎𝑐 2𝑎 When 𝑎 𝑥 2 +𝑏𝑥+𝑐=0

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Example 1

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Example 2

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Example 3

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Example 4

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Summary p.427

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Practice Ex. 7.7 (p.427) #1-11 #4-13

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8. Solving Problems FM20.9 Demonstrate an understanding of the characteristics of quadratic functions of the form y = a(x - p)² + q , including: vertex intercepts domain and range axis of symmetry.

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8. Solving Problems

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Example 2

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Example 3

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Example 4

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Summary p.436

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Practice Ex. 7.8 (p.436) #1-8 #2-12

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Math 20-1 Chapter 3 Quadratic Functions

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