Math Problem Statement

The graph above is a transformation of the function f(x)=|x|

Write an equation for the function graphed above

The graph above is a transformation of the function f(x) = |x|. Write an equation for the function graphed above.

Solution

The given graph is a transformation of the absolute value function f(x)=xf(x) = |x|. Let's analyze the graph step by step to find the equation for g(x)g(x).

  1. Reflection: The graph opens downward for x<0x < 0, indicating a reflection over the x-axis on the left side of the y-axis. This means the graph for negative values of xx is multiplied by 1-1.

  2. Slope: For x0x \geq 0, the graph increases with a slope of 1, which is consistent with the parent function f(x)=xf(x) = |x|. However, for x<0x < 0, the slope of the graph is steeper. It has a slope of 2-2, indicating a vertical stretch by a factor of 2 for negative xx-values.

  3. Vertex: The vertex of the graph is at (0,1)(0, -1). This indicates a downward vertical shift of 1 unit.

Putting it all together:

The graph is a piecewise function with the following transformations:

  • For x0x \geq 0, the function follows the standard absolute value function, but with a downward shift by 1 unit: x1x - 1.
  • For x<0x < 0, the graph has a vertical stretch by 2, and it is reflected (negative slope) with the same downward shift.

Thus, the equation for g(x)g(x) is:

\begin{cases} -2x - 1 & \text{for } x < 0 \\ x - 1 & \text{for } x \geq 0 \end{cases}$$ Would you like further explanation on any part of this process? Here are 5 related questions: 1. What transformations affect the shape of an absolute value graph? 2. How do you recognize vertical and horizontal shifts in a graph? 3. What does a vertical stretch mean in terms of transformations? 4. How can you write a piecewise function based on graph analysis? 5. How does reflecting a graph over the x-axis or y-axis affect its equation? **Tip**: Always check for shifts, reflections, and stretches/compressions when identifying transformations of a function graph.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Graph Transformations
Piecewise Functions

Formulas

f(x) = |x|
Piecewise function definition

Theorems

Reflection over the x-axis
Vertical Stretch/Compression

Suitable Grade Level

Grades 9-12