Math Problem Statement

Use the graph of y = f(x) to graph the function y = -2f(x - 1) - 2. Label the points on the sketch.

Solution

The task requires graphing the function y=2f(x1)2y = -2f(x-1) - 2 using the graph of y=f(x)y = f(x). The points provided are based on transformations applied to the original function f(x)f(x). Let’s break down the transformations:

  • The (x1)(x-1) represents a horizontal shift to the right by 1 unit.
  • The multiplication by 2-2 reflects the graph vertically (because of the negative sign) and stretches it by a factor of 2.
  • Finally, the 2-2 represents a vertical shift down by 2 units.

Given Points and Transformation:

You are provided with the following points on f(x)f(x):

  1. (4,4)(-4, -4)
  2. (1,3)(-1, -3)
  3. (0,0)(0, 0)
  4. (1,4)(1, -4)
  5. (3,3)(3, 3)

Let's apply the transformation y=2f(x1)2y = -2f(x-1) - 2 to these points:

  1. Point (-4, -4): Shift x=4+1=3,y=2(4)2=82=6\text{Shift } x = -4 + 1 = -3, \quad y = -2(-4) - 2 = 8 - 2 = 6 Transformed point: (3,6)(-3, 6)

  2. Point (-1, -3): Shift x=1+1=0,y=2(3)2=62=4\text{Shift } x = -1 + 1 = 0, \quad y = -2(-3) - 2 = 6 - 2 = 4 Transformed point: (0,4)(0, 4)

  3. Point (0, 0): Shift x=0+1=1,y=2(0)2=02=2\text{Shift } x = 0 + 1 = 1, \quad y = -2(0) - 2 = 0 - 2 = -2 Transformed point: (1,2)(1, -2)

  4. Point (1, -4): Shift x=1+1=2,y=2(4)2=82=6\text{Shift } x = 1 + 1 = 2, \quad y = -2(-4) - 2 = 8 - 2 = 6 Transformed point: (2,6)(2, 6)

  5. Point (3, 3): Shift x=3+1=4,y=2(3)2=62=8\text{Shift } x = 3 + 1 = 4, \quad y = -2(3) - 2 = -6 - 2 = -8 Transformed point: (4,8)(4, -8)

Choose the Correct Graph:

Now, compare the transformed points with the graphs (A and B). Based on the transformation:

  • The point (1,2)(1, -2) suggests the curve will go below the xx-axis.
  • Points like (0,4)(0, 4) and (2,6)(2, 6) suggest the graph will have a stretch above the xx-axis.

From these clues, Graph B is the correct representation, as it matches the transformations we’ve computed.

Do you want further details on the transformation process or the points?

Relative questions:

  1. How do horizontal and vertical shifts affect the graph of a function?
  2. What is the effect of a vertical stretch by a factor of 2 on a graph?
  3. How does a reflection across the x-axis change the graph?
  4. How do you determine the correct graph after applying transformations?
  5. What would happen if you reflected the graph across the y-axis instead?

Tip: Always apply transformations step-by-step, especially when multiple transformations are involved.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Transformations of Functions
Graphing
Algebra

Formulas

y = -2f(x - 1) - 2

Theorems

Vertical Stretch
Reflection Across the X-Axis
Horizontal Shift
Vertical Shift

Suitable Grade Level

Grades 9-12