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Absolute Value Functions Grade: 11 Subject: Pre-‐Calculus 11 Unit: Absolute Value Learning Target: Develop an understanding of the graphs of absolute value. Curriculum Outcomes:
GCO’s SCO’s Students will be expected to develop algebraic reasoning and number sense.
RF02: Graph and analyze absolute value functions to solve problems.
Screencast Links: Absolute Value Functions: Transformations: https://www.youtube.com/watch?v=bgpVnRzFg2w Absolute Value Functions: Equations from the Graph: https://www.youtube.com/watch?v=SkNx0jEtMQs Expected Time: 2 classes Resources: (Tools & Tech)
Lesson Procedure
I do: Introduction of absolute value functions. Video available to watch after activity, but the intention is for students to make their own predictions and conclusions based on the graphs that are drawn using technology.
Desmos.com Can be accessed using laptops or hand held device.
You do: Student worksheet on transformations of absolute value functions. Students will need access to the Desmos app or desmos.com on a laptop.
We Share: Have a group discussion regarding how transformations affect the parent function of 𝑦 = |𝑥|.
Screencast Videos: Transformations Equation of Graph
I do: Formal explanation of transformations of absolute value graphs. Explain how the vertex is related to the transformations. Lead into how to find the equation of an absolute value graph and how to re-‐write as a piecewise function. Videos available for review or further explanation for students.
We do: With a partner, determine the equation of an absolute value function given the graph. The worksheet will develop the concept of piecewise functions.
I do: Lead a discussion regarding how to find the equation from a graph and how this changes as the number of transformations of the function increases. How will the shape be affected, and how to tell if the equation found is indeed accurate.
Student Worksheets: Transformations of 𝑓 𝑥 = |𝑥| Equation from the Graph
ABSOLUTE VALUE FUNCTIONS Transformations of 𝑓 𝑥 = |𝑥|
To complete this activity use the desmos app or desmos.com.
• Graph each of the following function using a different colour. • Describe the transformation of each graph from the parent function, 𝑓 𝑥 = |𝑥| • Insert a screenshot of your graphs below the table.
Function Colour Used Description of Transformation
𝑓 𝑥 = |𝑥|
Parent Function
𝑓 𝑥 = 𝑥 + 2
𝑓 𝑥 = 𝑥 − 5
𝑓 𝑥 = − 𝑥
𝑓 𝑥 =12 𝑥
𝑓 𝑥 = 3 𝑥
𝑓 𝑥 = 𝑥 − 4
𝑓 𝑥 = 𝑥 + 3
Solutions:
Function Colour Used Description of Transformation
𝑓 𝑥 = |𝑥|
Black
Parent Function
𝑓 𝑥 = 𝑥 + 2
Blue
Up 2
𝑓 𝑥 = 𝑥 − 5
Green
Down 5
𝑓 𝑥 = − 𝑥
Purple
Reflect over x-‐axis
𝑓 𝑥 =12 𝑥
Red
Shrink
𝑓 𝑥 = 3 𝑥
Orange
Stretch
𝑓 𝑥 = 𝑥 − 4
Red (broken line)
Right 4
𝑓 𝑥 = 𝑥 + 3
Blue (broken line)
Left 3
ABSOLUTE VALUE FUNCTIONS Equation from the Graph
• Identify the vertex. • Write the equation of the following graphs in the form 𝑦 = 𝑎|𝑥 − ℎ|+ 𝑘. • Re-‐write each graph as a piecewise function. • Use Desmos to verify your piecewise functions.
1. 2.
Vertex: Vertex Equation: Equation: Piecewise Function: Piecewise Function: 3. 4.
Vertex: Vertex Equation: Equation: Piecewise Function: Piecewise Function:
5. 6.
Vertex: Vertex Equation: Equation: Piecewise Function: Piecewise Function: 7. 8.
Vertex: Vertex Equation: Equation: Piecewise Function: Piecewise Function: How are the piecewise functions related to the parent function y = x ?