Math Problem Statement

Given f(x), draw the following: a) f(-x), b) -f(x), c) -f(-x).

Solution

The question asks to manipulate the graph of the function f(x)f(x) in three different ways:

  1. f(x)f(-x): This represents a reflection of the graph of f(x)f(x) across the y-axis. To draw this, flip the graph horizontally. For example, a point (a,b)(a, b) on the original graph will become (a,b)(-a, b) on the new graph.

  2. f(x)-f(x): This represents a reflection of the graph of f(x)f(x) across the x-axis. To draw this, flip the graph vertically. A point (a,b)(a, b) on the original graph will become (a,b)(a, -b) on the new graph.

  3. f(x)-f(-x): This combines both transformations: first reflect the graph horizontally across the y-axis (giving f(x)f(-x)), and then reflect that result vertically across the x-axis (giving f(x)-f(-x)).

Let's now break it down:

Original graph of f(x)f(x):

  • There is a downward curve from (3,4)(-3, 4) to (0,0)(0, 0).
  • A small line segment from (0,0)(0, 0) to (1,1)(1, 1).
  • An open circle at (1,2)(1, 2) followed by a horizontal line from (1,3)(1, 3) to (2,3)(2, 3).
  • An upward line starting from an open circle at (2,3)(2, 3) and passing through (3,4)(3, 4).

a) f(x)f(-x):

  • Reflect the graph across the y-axis. For example:
    • (3,4)(-3, 4) becomes (3,4)(3, 4),
    • (0,0)(0, 0) stays the same,
    • (1,1)(1, 1) becomes (1,1)(-1, 1),
    • The rest follows similarly.

b) f(x)-f(x):

  • Reflect the graph across the x-axis. For example:
    • (3,4)(-3, 4) becomes (3,4)(-3, -4),
    • (0,0)(0, 0) stays the same,
    • (1,1)(1, 1) becomes (1,1)(1, -1),
    • And so on.

c) f(x)-f(-x):

  • First reflect the graph across the y-axis (as in part a), and then reflect the result across the x-axis. For example:
    • (3,4)(-3, 4) becomes (3,4)(3, 4) (after reflecting across y-axis), and then (3,4)(3, -4) after reflecting across x-axis.
    • Continue similarly for the rest of the graph.

Do you want me to create the graphs for each transformation?

Follow-up Questions:

  1. What general effect does f(x)f(-x) have on a graph?
  2. How does the transformation f(x)-f(x) change the shape of a function graphically?
  3. Can you combine multiple transformations like f(x)-f(-x)? How?
  4. How can the domain and range change when applying transformations like these?
  5. What are the coordinates of key points after applying f(x)-f(x) to your graph?

Tip: When transforming functions, always reflect points individually to ensure accuracy.

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Math Problem Analysis

Mathematical Concepts

Function transformations
Reflections of graphs

Formulas

f(-x) reflects across y-axis
-f(x) reflects across x-axis
-f(-x) reflects across both axes

Theorems

Reflection across the axes

Suitable Grade Level

Grades 9-12