Math Problem Statement

Graph ​f(x)equals5 ln left parenthesis x right parenthesis. Question content area bottom Part 1 Choose the correct graph. A. -10 10 -10 10 x y

A coordinate system has a horizontal x-axis labeled from negative 10 to 10 in increments of 2 and a vertical y-axis labeled from negative 10 to 10 in increments of 2. From left to right, a curve rises steeply in quadrant 4, crosses the x-axis at 1, and then rises at a decreasing rate in quadrant 1 passing approximately through the following points: (2, 1.4); left parenthesis 3 comma 2.2 right parenthesis. As x approaches 0 from the right, the curve approaches negative infinity. B. -10 10 -10 10 x y

A coordinate system has a horizontal x-axis labeled from negative 10 to 10 in increments of 2 and a vertical y-axis labeled from negative 10 to 10 in increments of 2. From left to right, a curve rises steeply in quadrant 4, crosses the x-axis at 1, and then rises at a decreasing rate in quadrant 1 passing approximately through the following points: (2, 3.5); left parenthesis 3 comma 5.5 right parenthesis. As x approaches 0 from the right, the curve approaches negative infinity. C. -10 10 -10 10 x y

A coordinate system has a horizontal x-axis labeled from negative 10 to 10 in increments of 2 and a vertical y-axis labeled from negative 10 to 10 in increments of 2. From left to right, a curve rises steeply in quadrant 4, crosses the x-axis at 1, and then rises at a decreasing rate in quadrant 1 passing approximately through the following points: (2, 2.8), left parenthesis 3 comma 4.4 right parenthesis. As x approaches 0 from the right, the curve approaches negative infinity. D. -10 10 -10 10 x y

Solution

The function you're asked to graph is f(x)=5ln(x)f(x) = 5 \ln(x), which is a scaled version of the natural logarithmic function. Let's break down the key features of this graph:

  1. Domain: The natural logarithmic function ln(x)\ln(x) is only defined for x>0x > 0, so the graph will not exist for x0x \leq 0.

  2. Intercepts:

    • The function will cross the x-axis at x=1x = 1 because ln(1)=0\ln(1) = 0, and scaling by 5 keeps the value at 0.
    • The y-axis is not in the domain of the function, but as xx approaches 0 from the right, the function approaches negative infinity.
  3. Behavior:

    • As x0+x \to 0^+, ln(x)\ln(x) \to -\infty, so the graph will steeply drop towards negative infinity as it approaches x=0x = 0.
    • As xx \to \infty, the graph will rise at a decreasing rate since the logarithmic function grows slowly for large values of xx.
  4. Key Points:

    • At x=1x = 1, the function crosses the x-axis: f(1)=5ln(1)=0f(1) = 5 \ln(1) = 0.
    • The function increases as xx gets larger, but at a decreasing rate.

Now, let's examine the options based on these features:

  • Option A describes a graph that rises steeply in quadrant 4, crosses the x-axis at 1, and rises at a decreasing rate with points approximately at (2, 1.4) and (3, 2.2). This matches the behavior of f(x)=5ln(x)f(x) = 5 \ln(x), so this is likely the correct choice.

  • Option B describes points at (2, 3.5) and (3, 5.5), which is not consistent with the expected behavior of f(x)=5ln(x)f(x) = 5 \ln(x) as it grows slower than these values suggest.

  • Option C describes points at (2, 2.8) and (3, 4.4), which is still too large for f(x)=5ln(x)f(x) = 5 \ln(x).

Therefore, Option A is the correct graph.

Would you like more details or clarifications on how the graph behaves? Here are some related questions for further exploration:

  1. How do transformations affect the graph of a logarithmic function?
  2. What is the general shape of the graph of y=ln(x)y = \ln(x)?
  3. How can you determine the horizontal asymptote of a logarithmic function?
  4. How does the natural logarithmic function compare to other logarithmic functions, such as log(x)\log(x)?
  5. How would you graph f(x)=ln(x)f(x) = \ln(x) without a calculator?

Tip: When graphing logarithmic functions, always remember that the function is undefined for x0x \leq 0, and check for vertical asymptotes near x=0x = 0.

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Math Problem Analysis

Mathematical Concepts

Logarithmic Functions
Domain and Range of Functions
Asymptotes
Function Transformations

Formulas

f(x) = 5 ln(x)

Theorems

Logarithmic Properties
Asymptotic Behavior of Logarithmic Functions

Suitable Grade Level

Grades 9-12