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- Quadratic Functions

Still Confused?

Try reviewing these fundamentals first

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Try reviewing these fundamentals first

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Get Started Now- Lesson: 112:53
- Lesson: 1a11:16
- Lesson: 1b9:27
- Lesson: 1c10:13
- Lesson: 1d6:30
- Lesson: 211:39
- Lesson: 2a7:46
- Lesson: 2b3:44
- Lesson: 312:53
- Lesson: 411:39

Three properties that are universal to all quadratic functions: 1) The graph of a quadratic function is always a parabola that either opens upward or downward (end behavior); 2) The domain of a quadratic function is all real numbers; and 3) The vertex is the lowest point when the parabola opens upwards; while the vertex is the highest point when the parabola opens downward.

Basic Concepts: Factoring trinomials, Solving quadratic equations using the quadratic formula, Completing the square, Shortcut: Vertex formula

Related Concepts: Even and odd functions, What is a polynomial function?, Characteristics of polynomial graphs

- 1.
**Determining the Characteristics of a Quadratic Function Using Various Methods**Determine the following characteristics of the quadratic function $y = -2x^2 + 4x + 6$:

• Opening of the graph

• $y-$intercept

• $x-$intercept(s)

• Vertex

• Axis of symmetry

• Domain

• Range

• Minimum/Maximum value

a)Using factoringb)Using the quadratic formulac)Using completing the squared)Using the vertex formula - 2.From the graph of the parabola, determine the:

• vertex

• axis of symmetry

• y-intercept

• x-intercepts

• domain

• range

• minimum/maximum value

a)

b)

- 3.Identifying Characteristics of Quadratic function in General Form: $y = ax^2 + bx+c$

$y = 2{x^2} - 12x + 10$ is a quadratic function in general form.

i) Determine:

• y-intercept

• x-intercepts

• vertex

ii) Sketch the graph. - 4.Identifying Characteristics of Quadratic Functions in Vertex Form: $y = a(x-p)^2 + q$

$y = 2{\left( {x - 3} \right)^2} - 8$ is a quadratic function in vertex form.

i) Determine:

• y-intercept

• x-intercepts

• vertex

ii) Sketch the graph.

2.

Quadratic Functions

2.1

Introduction to quadratic functions

2.2

Transformations of quadratic functions

2.3

Completing the square

2.4

Converting from general to vertex form by completing the square

2.5

Shortcut: Vertex formula

2.6

Characteristics of quadratic functions

2.7

Finding the quadratic functions for given parabolas

2.8

Applications of quadratic functions