Math Problem Statement

The graph shows a transformation of f(x) to g(x), where g(x) = A f(Bx). Determine the values of A and B from the graphs.

Solution

To solve this problem, let's analyze the graphs and understand the transformations applied to the function f(x)f(x) to get g(x)g(x).

Analyzing the Graphs:

  1. First Graph: f(x)f(x)

    • The graph of f(x)f(x) appears to be a "V" shape. It starts from point (0, 0), goes up to point (2, 4), and then goes back down to point (4, 0).
  2. Second Graph: g(x)g(x)

    • The graph of g(x)g(x) is also a "V" shape but looks different from f(x)f(x). It starts from point (0, 0), goes down to point (1, -4), and then back up to point (2, 0).

Identifying the Transformation:

The problem states that g(x)g(x) is a transformation of f(x)f(x) in the form:

g(x)=Af(Bx)g(x) = A f(Bx)

Where AA and BB are constants.

Determining AA and BB:

  1. Vertical Stretch/Compression (A):

    • The maximum (and minimum) values of f(x)f(x) are 4 and 0, respectively. For g(x)g(x), the corresponding values are 0 and -4.
    • This change suggests a reflection over the x-axis and a vertical stretch by a factor of 4.
    • Therefore, A=2A = -2.
  2. Horizontal Stretch/Compression (B):

    • Comparing the x-values where the critical points occur:
      • In f(x)f(x), the "V" shape has its vertex at (2, 0).
      • In g(x)g(x), the "V" shape has its vertex at (1, 0).
      • This suggests a horizontal compression by a factor of 2. Thus, B=2B = 2.

Hence, the transformation can be written as:

g(x)=2f(2x)g(x) = -2 f(2x)

Conclusion:

The values for the transformation parameters are:

  • A=2A = -2
  • B=2B = 2

Would you like more details or have any questions about this solution?

Further Questions to Explore:

  1. How do vertical and horizontal transformations affect the graph of a function?
  2. What would happen if the values of AA and BB were different?
  3. How can we determine reflections in function transformations?
  4. Can you derive a general rule for identifying transformations from graphs?
  5. What other types of transformations can be applied to a function?

Tip:

When analyzing function transformations, always look for changes in key points (like intercepts and extrema) to determine the nature of the transformation.

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Math Problem Analysis

Mathematical Concepts

Function transformations
Graphical analysis

Formulas

g(x) = A f(Bx)

Theorems

Transformation theorem for function stretching and compression

Suitable Grade Level

Grades 10-12