Math Problem Statement

The domain of a certain exponential function is all real numbers. The range of the function is all real numbers greater than -3. The graph of the function has a horizontal asymptote at y = -3. Select a graph or graphs to fit the description of the function.

Solution

The problem describes an exponential function with the following characteristics:

  1. Domain: All real numbers.
  2. Range: All real numbers greater than -3.
  3. Horizontal asymptote: y=3y = -3.

Explanation:

  • The horizontal asymptote y=3y = -3 indicates that the graph approaches -3 but never touches it.
  • Since the range is y>3y > -3, the graph is shifted downward from the standard exponential graph and is above y=3y = -3.
  • The domain being all real numbers suggests the graph extends infinitely in both the positive and negative xx-directions.
  • The graph likely represents a function of the form y=abx3y = a \cdot b^x - 3, where a>0a > 0 and b>0b > 0, because it has a positive growth trend.

Matching Graphs:

From the image, it appears the first graph (top) correctly fits the description:

  • The graph is above y=3y = -3.
  • It has a horizontal asymptote at y=3y = -3.
  • It extends in both directions, consistent with the domain of all real numbers.

The second graph (bottom) does not fit, as it appears to have a horizontal asymptote at y=0y = 0, which contradicts the problem's conditions.


Do you want further clarification or need help with related concepts?

Related Questions:

  1. What is the general form of an exponential function with a horizontal shift?
  2. How does changing the base bb of an exponential function affect its graph?
  3. What is the significance of the range and asymptotes in defining a function?
  4. How can transformations (shifts, stretches, etc.) of graphs be identified algebraically?
  5. How is the horizontal asymptote calculated for exponential functions?

Tip:

Remember, the horizontal asymptote of a function f(x)=abx+cf(x) = a \cdot b^x + c is always y=cy = c.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Domain and Range
Asymptotes

Formulas

General Exponential Function: y = a * b^x + c

Theorems

Properties of Exponential Functions

Suitable Grade Level

Grades 9-12