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2.5 Absolute Value Functions and Graphs Graphing NEGATIVE Absolute Value Functions.

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Presentation on theme: "2.5 Absolute Value Functions and Graphs Graphing NEGATIVE Absolute Value Functions."— Presentation transcript:

1 2.5 Absolute Value Functions and Graphs Graphing NEGATIVE Absolute Value Functions

2 Negative Absolute Value Functions The vertex is a MAXIMUM Negative absolute value functions open DOWN

3 Finding the Vertex For an equation y = -|mx + b| + c, vertex = -b, c m Example:Find the vertex of y = -|x + 1| - 2

4 Finding the Vertex For an equation y = |mx + b| + c, vertex = -b, c m Example: Find the vertex of y = -|x + 1| - 2 Answer:= -1, -2 1 = -1, -2

5 Absolute Value Functions Steps to graphing a negative absolute value function… 1.Find the vertex 2.Write two linear equations and find slope 3.Use slope to plot points, connect the dots

6 Absolute Value Functions Example 1: Graph y = -|3x + 12|

7 Absolute Value Functions Step 1: Find the vertex y = -|3x + 12| m = -b = c =

8 Absolute Value Functions Step 1: Find the vertex y = -|3x + 12| m = 3 -b = -12 c = 0

9 Absolute Value Functions Step 1: Find the vertex y = -|3x + 12| m = 3 -b = -12 c = 0 vertex=-b, c m vertex=-12, 0 3 vertex=(-4, 0)

10 Absolute Value Functions Step 1: Find the vertex vertex = (-4, 0)

11 Absolute Value Functions Step 2: Write two linear equations and find slope. y = -|3x + 12| PositiveNegative

12 Absolute Value Functions Step 2: Write two linear equations and find slope. y = -|3x + 12| PositiveNegative y = -3x - 12 y = -(-3x – 12) y= 3x + 12 m 1 = -3 m 2 = 3

13 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-4, 0) m 1 = -3 m 2 = 3

14 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-4, 0) m 1 = -3 m 2 = 3

15 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-4, 0) m 1 = -3 m 2 = 3

16 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-4, 0) m 1 = -3 m 2 = 3

17 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-4, 0) m 1 = -3 m 2 = 3

18 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-4, 0) m 1 = -3 m 2 = 3

19 Absolute Value Functions Example 2: Graph y = -|3x + 6| - 2

20 Absolute Value Functions Step 1: Find the vertex y = -|3x + 6| - 2

21 Absolute Value Functions Step 1: Find the vertex y = -|3x + 6| - 2 m = 3 -b = -6 c = -2 vertex = (-6/3, -2) = (-2, -2)

22 Absolute Value Functions Step 1: Find the vertex vertex = (-2, -2)

23 Absolute Value Functions Step 2:Write two linear equations and find slope y = -|3x + 6| - 2 Positive Negative

24 Absolute Value Functions Step 2:Write two linear equations and find slope y = -|3x + 6| - 2 Positive Negative y + 2 = -(3x + 6) y + 2 = -[-(3x + 6)] y + 2= -3x – 6 y + 2 = 3x + 6 y= -3x – 8 y= 3x + 4

25 Absolute Value Functions Step 2:Write two linear equations and find slope y = -|3x + 6| - 2 Positive Negative y + 2 = -(3x + 6) y + 2 = -[-(3x + 6)] y + 2= -3x – 6 y + 2 = 3x + 6 y= -3x – 8 y= 3x + 4 m 1 = -3 m 2 = 3

26 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-2, -2) m 1 = -3 m 2 = 3

27 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-2, -2) m 1 = -3 m 2 = 3

28 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-2, -2) m 1 = -3 m 2 = 3

29 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-2, -2) m 1 = -3 m 2 = 3

30 Absolute Value Functions Step 3: Use the slope to plot points vertex = (-2, -2) m 1 = -3 m 2 = 3

31 Homework p.90 #7-9, 22, 40, 44, 45


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