Quadratics: Graphing and Standard Form

Slides:



Advertisements
Similar presentations
6.1/6.2/6.6/6.7 Graphing , Solving, Analyzing Parabolas
Advertisements

By: Silvio, Jacob, and Sam.  Linear Function- a function defined by f(x)=mx+b  Quadratic Function-a function defined by f(x)=ax^2 + bx+c  Parabola-
Quadratic Functions.
 Quadratic Equation – Equation in the form y=ax 2 + bx + c.  Parabola – The general shape of a quadratic equation. It is in the form of a “U” which.
Quadratic Functions; An Introduction
Quadratic graphs Today we will be able to construct graphs of quadratic equations that model real life problems.
Chapter 9: Quadratic Equations and Functions Lesson 1: The Function with Equation y = ax 2 Mrs. Parziale.
Module 3 Lesson 5: Basic Quadratic Equation Standard Form and Vertex Form Translations Affect of changing a Translations Affect of changing h Translations.
Graphing Quadratic Functions
1.The standard form of a quadratic equation is y = ax 2 + bx + c. 2.The graph of a quadratic equation is a parabola. 3.When a is positive, the graph opens.
And the Quadratic Equation……
Topic: U2 L1 Parts of a Quadratic Function & Graphing Quadratics y = ax 2 + bx + c EQ: Can I identify the vertex, axis of symmetry, x- and y-intercepts,
1.1 Graphing Quadratic Functions (p. 249)
Graphs of Quadratic Equations. Standard Form: y = ax 2 +bx+ c Shape: Parabola Vertex: high or low point.
Quadratic Functions. The graph of any quadratic function is called a parabola. Parabolas are shaped like cups, as shown in the graph below. If the coefficient.
Quadratic functions A. Quadratic functions B. Quadratic equations C. Quadratic inequalities.
 Quadratic function ◦ A function that can be written in the standard form ◦ ax 2 +bx+c ◦ a is never “0” ◦ Domain of the function is all real numbers.
The General Quadratic Function Students will be able to graph functions defined by the general quadratic equation.
Graphs of Quadratic Functions
Bell Ringer 4/2/15 Find the Axis of symmetry, vertex, and solve the quadratic eqn. 1. f(x) = x 2 + 4x f(x) = x 2 + 2x - 3.
1 Warm-up Factor the following x 3 – 3x 2 – 28x 3x 2 – x – 4 16x 4 – 9y 2 x 3 + x 2 – 9x - 9.
Name: Date: Topic: Solving & Graphing Quadratic Functions/Equations Essential Question: How can you solve quadratic equations? Warm-Up : Factor 1. 49p.
Graphing Quadratic Equations
QUADTRATIC RELATIONS. A relation which must contain a term with x2 It may or may not have a term with x and a constant term (a term without x) It can.
Aim: Review of Parabolas (Graphing) Do Now : Write down the standard equation of a parabola Answer: y = ax 2 + bx + c Homework: (Workbook) pg 427 (Part.
2.3 Quadratic Functions. A quadratic function is a function of the form:
Sections 11.6 – 11.8 Quadratic Functions and Their Graphs.
WARM UP Simplify (-14) x 2, for x = 3 4.
Characteristics of Quadratics
5-1 Modeling Data With Quadratic Functions Big Idea: -Graph quadratic functions and determine maxima, minima, and zeros of function. -Demonstrate and explain.
Ch 9: Quadratic Equations C) Graphing Parabolas
10.1 & 10.2: Exploring Quadratic Graphs and Functions Objective: To graph quadratic functions.
Chapter 9.1 Notes. Quadratic Function – An equation of the form ax 2 + bx + c, where a is not equal to 0. Parabola – The graph of a quadratic function.
To find the x coordinate of the vertex, use the equation Then substitute the value of x back into the equation of the parabola and solve for y. You are.
2.1 – Quadratic Functions.
Section 3.1 Review General Form: f(x) = ax 2 + bx + c How the numbers work: Using the General.
QUADRATIC FUNCTIONS IN STANDARD FORM 4.1B. Review  A quadratic function can be written in the form y = ax 2 + bx + c.  The graph is a smooth curve called.
10.1 Quadratic GRAPHS!.
Warm Up Lesson 4.1 Find the x-intercept and y-intercept
Quadratic Functions Solving by Graphing Quadratic Function Standard Form: f(x) = ax 2 + bx + c.
Unit 1B Quadratics Day 2. Graphing a Quadratic Function EQ: How do we graph a quadratic function in standard form? M2 Unit 1B: Day 2 Lesson 3.1A.
5-1 Graphing Quadratic Functions Algebra II CP. Vocabulary Quadratic function Quadratic term Linear term Constant term Parabola Axis of symmetry Vertex.
How does the value of a affect the graphs?
Bellwork  Identify the domain and range of the following quadratic functions
Graphing Quadratic Functions (9-1) Objective: Analyze the characteristics of graphs of quadratic functions. Graph quadratic functions.
1 Quadratic functions A. Quadratic functions B. Quadratic equations C. Quadratic inequalities.
Quadratic Function Finding the Solutions (roots) of a Quadratic Function by Graphing.
Graphing Quadratic Functions Digital Lesson. 2 Quadratic function Let a, b, and c be real numbers a  0. The function f (x) = ax 2 + bx + c is called.
Do Now Find the value of y when x = -1, 0, and 2. y = x2 + 3x – 2
Chapter 3 Quadratic Functions
Properties of Quadratic Functions in Standard Form 5-1
Objectives Transform quadratic functions.
ALGEBRA I : SECTION 9-1 (Quadratic Graphs and Their Properties)
Lesson 2.1 Quadratic Functions
5.1 Modeling Data with Quadratic Functions
3.1 Quadratic Functions and Models
GRAPHING QUADRATIC FUNCTIONS
Find the x-coordinate of the vertex
Graphing Quadratic Functions (10.1)
Review: Simplify.
Warm-up: Sketch y = 3|x – 1| – 2
Chapter 8 Quadratic Functions.
Warm Up Evaluate (plug the x values into the expression) x2 + 5x for x = 4 and x = –3. 2. Generate ordered pairs for the function y = x2 + 2 with the.
Graphing Quadratic Functions
Graphs of Quadratic Functions Part 1
Some Common Functions and their Graphs – Quadratic Functions
Chapter 8 Quadratic Functions.
3.1 Quadratic Functions and Models
Section 10.2 “Graph y = ax² + bx + c”
Quadratic Functions and Equations Lesson 1: Graphing Quadratic Functions.
Presentation transcript:

Quadratics: Graphing and Standard Form

What is a Quadratic Equation?

What shape is formed if the above scenario is graphed? Suppose you have a tennis ball and you toss it in the air. Then, you catch it with the other hand at the same height at which you started…What path does the ball take as it travels from one hand to the other? What shape is formed if the above scenario is graphed?

A would result (upside down U) – this is a Parabola! Parabolas have a “U” shape when you graph them on paper (2-dimensional). However a “real-life” parabola is more like a bowl shape. A satellite is an example of a parabola.

f(x) = Ax2+ Bx + C These graphs are called Quadratic Functions. A quadratic function can be described by an equation of the following form: f(x) = Ax2+ Bx + C There are 2 ways to write Quadratic Functions Standard Form and Vertex Form The above equation is in Standard Form. We will look at this form first.

Parts of a Quadratic Function f(x)= Ax2+Bx+C Ax2 Quadratic Term Bx Linear Term C Constant Term

Explore Quadratic Equations In Standard Form

Gizmo: How A, B, and C affect the quadratic function. For a more straightforward explanation on the affect of A, B, and C. Look at the following Gizmo. Gizmo: How A, B, and C affect the quadratic function. To explore the affect the variables A, B, and C have on the graph, play the Zap It game found at the following link. Zap It Game

On your graphing calculator… Graph y= x2 Graph y = -x2 What do you see? What is A in the above two equations and how does it affect the graph?

Gizmo: Standard Form, Vertex, and Intercepts In this equation, A = -1 In this equation, A = 1 Gizmo: Standard Form, Vertex, and Intercepts Gizmo: Standard Form, Vertex, and Intercepts (B)

If A = 0, the graph is not quadratic, it is linear. f(x) = Ax2+ Bx + C If A = 0, the graph is not quadratic, it is linear. If A is not 0, B and/or C can be 0 and the function is still a quadratic function. If A < 0, The parabola opens down, like an umbrella. If A > 0, The parabola opens up, like an bowl. In this equation, A = -1 In this equation, A = 1

When "a" is positive, the graph of y = ax2 + bx + c opens upward and the vertex is the lowest point on the curve. As the value of the coefficient "a" gets larger, |a| > 1, the parabola narrows. As the value of the coefficient “a” gets smaller, | a | is between 0 and 1, the parabola widens.

For the graph of y = Ax2 + Bx + C If C is positive, the graph shifts up C units If C is negative, the graph shifts down C units Since C is negative, -5, the graph shifts down 5 units Since C is positive, 12, the graph shifts up 12 units. Note: This graph would open upside down since A is -2 Since C is negative, -8, the graph shifts down 8 units

Parts of Parabolas The graph of a quadratic function is a U-shaped graph called a parabola. The vertex is the highest or lowest point on the graph. The vertex is the lowest point on the parabola if the parabola opens upward and is the highest point on the parabola if the parabola opens downward. The vertex represents the maximum or minimum value of a function. In the graphs, the parabolas are symmetric about the axis of symmetry. In general, the axis of symmetry is a vertical line through the vertex that divides the parabola into two symmetrical parts. Each point on the graph has a corresponding point on its mirror image. These points are equidistant from the axis of symmetry.

This is also the minimum (lowest point on this graph) y = 2x2 -8x + 8 Vertex (0,2) Axis of Symmetry x= 2 This is also the minimum (lowest point on this graph)

Standard Form y = Ax2 + Bx + C Axis of symmetry x = -B/2A Vertex: (x,y) To find: The number from the axis of symmetry is your x- coordinate Plug x into the equation to solve for you y-coordinate Y-intercept: C

Vertex: ; This is the minimum for this graph y=Ax2 + Bx + C To find the axis of symmetry and vertex of a Quadratic Function follow these steps. Name A, B, C The axis of symmetry is To find the vertex, take the x value you received from the axis of symmetry and plug it in to the given quadratic equation and solve to find the value of y. For example, y=2x2-3x+5 A= 2, B= -3, C= 5 Axis of Symmetry: Vertex ( ¾ , ??) y=2( ¾ )2 -3( ¾) + 5 y = Vertex: ; This is the minimum for this graph The y-intercept is (0, 5). You can find the y-intercept by letting x equal 0 just like you did in linear equations.

Name the axis of symmetry and vertex of y=2x2-4x+1 B= C= 2 -4 1 2. Axis of Symmetry x =  x =4/4  x = 1 The y-intercept is (0, 1). 3. Vertex ( 1 , ???) y = 2(1)2 – 4(1) + 1 y = -1 Vertex: (1, -1) ; Minimum