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2.8 Absolute Value Functions
Absolute Value Functions
• The absolute value of x is defined by:




• The graph of y = |x| looks like a v-shape.




                vertex
Why are they important?
• Have you ever played pool or putt-putt
  golf?
• The path of the ball when making a bank
  shot is an example of an absolute value
  function.
Transformations
• There are four ways the absolute value graph
  can be changed:
1. Open Up or Open Down

2. Change in Width – sides can be steeper or
   less steep

3. Horizontal Shift – vertex moves left or right

4. Vertical Shift- vertex moves up or down
General Form
• y = a |x – h| + k

• Effects of a:
• When a > 0 (positive), the V opens up.
• When a < 0 (negative), the V opens down.
• When |a| < 1, the sides are less steep than
  y = |x|.
• When |a| > 1, the sides are steeper than
   y = |x|.
Examples




Notice:
a is the slope of the right side of the graph!
Effect of h
               y = a |x – h| + k
• h shifts the vertex left or right
• The direction is opposite the sign of h
• Examples:
Effects of k
                y = a |x – h| + k
• k shifts the vertex up or down
• Positive k shifts up
• Negative k shifts down
• Examples:
The Vertex
• The vertex will be at (h, k).
• Example:
• Vertex: (-3, -4)

• Axis of symmetry:
  Vertical line through
   the vertex

                                  (-3, -4)
Your Turn!
• Find the vertex:
Graphing Absolute Value Functions
• Plot the vertex.
• Sketch the axis of symmetry.
• Use a (the slope) to graph the right side.
• Use symmetry to draw in the left side.

• Example:
Graph
Example:
• Graph
Your Turn!
• Graph
Example:
• Graph
Your Turn!
• Graph
Writing Absolute Value Functions
• y = a| x – h | + k

• Find the vertex (h, k)

• Count the slope (of the right side) to find a.
Example:
• Write an equation of the graph shown.
Your Turn!
• Write an equation of the graph shown.

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2.8 Absolute Value Functions

  • 1. 2.8 Absolute Value Functions
  • 2. Absolute Value Functions • The absolute value of x is defined by: • The graph of y = |x| looks like a v-shape. vertex
  • 3. Why are they important? • Have you ever played pool or putt-putt golf? • The path of the ball when making a bank shot is an example of an absolute value function.
  • 4. Transformations • There are four ways the absolute value graph can be changed: 1. Open Up or Open Down 2. Change in Width – sides can be steeper or less steep 3. Horizontal Shift – vertex moves left or right 4. Vertical Shift- vertex moves up or down
  • 5. General Form • y = a |x – h| + k • Effects of a: • When a > 0 (positive), the V opens up. • When a < 0 (negative), the V opens down. • When |a| < 1, the sides are less steep than y = |x|. • When |a| > 1, the sides are steeper than y = |x|.
  • 6. Examples Notice: a is the slope of the right side of the graph!
  • 7. Effect of h y = a |x – h| + k • h shifts the vertex left or right • The direction is opposite the sign of h • Examples:
  • 8. Effects of k y = a |x – h| + k • k shifts the vertex up or down • Positive k shifts up • Negative k shifts down • Examples:
  • 9. The Vertex • The vertex will be at (h, k). • Example: • Vertex: (-3, -4) • Axis of symmetry: Vertical line through the vertex (-3, -4)
  • 10. Your Turn! • Find the vertex:
  • 11. Graphing Absolute Value Functions • Plot the vertex. • Sketch the axis of symmetry. • Use a (the slope) to graph the right side. • Use symmetry to draw in the left side. • Example: Graph
  • 16. Writing Absolute Value Functions • y = a| x – h | + k • Find the vertex (h, k) • Count the slope (of the right side) to find a.
  • 17. Example: • Write an equation of the graph shown.
  • 18. Your Turn! • Write an equation of the graph shown.