Math Problem Statement

According to the Mini-Lesson, which of the following are TRUE regarding \( f(x) = a(b)^x \)? Check all that apply. Assume \( a > 0 \).

Solution

Let's analyze each statement to determine which are true for the exponential function f(x)=a(b)xf(x) = a(b)^x with a>0a > 0 and b>0b > 0.

  1. The Domain of the exponential functions is x>0x > 0: This is incorrect. The domain of exponential functions is all real numbers (xRx \in \mathbb{R}).

  2. The Range of the exponential functions is f(x)>0f(x) > 0: This is correct. Since a>0a > 0 and b>0b > 0, the output of the function will always be positive, meaning f(x)>0f(x) > 0.

  3. The Horizontal Asymptote is the line y=0y = 0: This is correct. For exponential functions, as xx approaches negative infinity, f(x)f(x) approaches zero but never reaches it, making y=0y = 0 the horizontal asymptote.

  4. The Domain of the exponential functions is All Real Numbers: This is correct. Exponential functions have a domain of xRx \in \mathbb{R}.

  5. The Horizontal Asymptote is the point (0,a)(0, a): This is incorrect. A horizontal asymptote is a line, not a point, and in this case, it’s y=0y = 0, not (0,a)(0, a).

  6. The Horizontal Asymptote is the line x=0x = 0: This is incorrect. The horizontal asymptote is y=0y = 0, not x=0x = 0.

  7. The Range of the exponential functions is All Real Numbers: This is incorrect. The range is f(x)>0f(x) > 0, not all real numbers.

Based on this analysis, the correct answers are:

  • The Range of the exponential functions is f(x)>0f(x) > 0.
  • The Horizontal Asymptote is the line y=0y = 0.
  • The Domain of the exponential functions is All Real Numbers.

Do you want more details on any of these points, or have any questions?

Related Questions:

  1. What would happen to the function's properties if aa or bb were negative?
  2. How do the domain and range of exponential functions compare to those of logarithmic functions?
  3. Why is y=0y = 0 considered a horizontal asymptote for most exponential functions?
  4. Can an exponential function have a horizontal asymptote other than y=0y = 0?
  5. How does changing the value of bb (growth vs. decay) affect the graph of the function?

Tip:

Remember that exponential functions of the form f(x)=a(b)xf(x) = a(b)^x always have a domain of all real numbers and usually a horizontal asymptote at y=0y = 0 when b>0b > 0.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Domain and Range
Asymptotes

Formulas

f(x) = a(b)^x

Theorems

Exponential function properties

Suitable Grade Level

Grades 9-12