Math Problem Statement

Graph the given​ functions, f and​ g, in the same rectangular coordinate system. Select integers for​ x, starting with​ -2 and ending with​ 2, and describe how the graph of g is related to the graph of f. f left parenthesis x right parenthesis equals x cubed​, g left parenthesis x right parenthesis equals x cubed plus 1

Solution

Let's begin by analyzing the functions f(x)=x3f(x) = x^3 and g(x)=x3+1g(x) = x^3 + 1.

1. Graph of f(x)=x3f(x) = x^3:

The graph of f(x)=x3f(x) = x^3 is a cubic function that passes through the origin (0,0) and has the following behavior:

  • As xx \to -\infty, f(x)f(x) \to -\infty
  • As x+x \to +\infty, f(x)+f(x) \to +\infty

2. Graph of g(x)=x3+1g(x) = x^3 + 1:

The function g(x)=x3+1g(x) = x^3 + 1 is similar to f(x)f(x), but it is vertically shifted up by 1 unit. For every value of xx, the output of g(x)g(x) is 1 greater than that of f(x)f(x).

Select integer values for xx from 2-2 to 22:

Let’s calculate the corresponding values for both f(x)f(x) and g(x)g(x) when x=2,1,0,1,2x = -2, -1, 0, 1, 2:

xxf(x)=x3f(x) = x^3g(x)=x3+1g(x) = x^3 + 1
-2(2)3=8(-2)^3 = -8(2)3+1=8+1=7(-2)^3 + 1 = -8 + 1 = -7
-1(1)3=1(-1)^3 = -1(1)3+1=1+1=0(-1)^3 + 1 = -1 + 1 = 0
003=00^3 = 003+1=0+1=10^3 + 1 = 0 + 1 = 1
113=11^3 = 113+1=1+1=21^3 + 1 = 1 + 1 = 2
223=82^3 = 823+1=8+1=92^3 + 1 = 8 + 1 = 9

Description of the relationship between the graphs:

  • The graph of g(x)g(x) is a vertical translation of the graph of f(x)f(x) by 1 unit upward. This means that for each xx, the corresponding value of g(x)g(x) is always 1 more than f(x)f(x).

I can now graph these functions for you if you'd like! Would you like me to do that, or do you have any further questions about this?


Here are a few related questions for you:

  1. How does the transformation affect the domain and range of the function?
  2. What happens if we modify the function to g(x)=x31g(x) = x^3 - 1?
  3. How do other cubic transformations, like x3+2x^3 + 2 or x33x^3 - 3, affect the graph?
  4. What would happen if we compared the graphs of f(x)=x3f(x) = x^3 and g(x)=x3g(x) = -x^3?
  5. What effect does adding a constant to the exponent have on the graph of a cubic function?

Tip: When analyzing transformations of graphs, remember that adding a constant to the function (like f(x)+cf(x) + c) results in a vertical shift of the graph, where the sign of cc determines the direction (up if c>0c > 0, down if c<0c < 0).

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Math Problem Analysis

Mathematical Concepts

Functions
Graphing
Cubic Functions
Transformations of Functions

Formulas

f(x) = x^3
g(x) = x^3 + 1

Theorems

Vertical Shift of Functions

Suitable Grade Level

Grades 9-11