Math Problem Statement

Find an equation for the graph sketched below

Solution

The graph shown appears to resemble the general shape of a logarithmic function, which typically takes the form:

f(x)=aln(b(xh))+kf(x) = a \ln(b(x - h)) + k

where:

  • aa is a vertical stretch or compression factor,
  • bb affects the horizontal scaling,
  • hh represents a horizontal shift,
  • kk is a vertical shift.

Observing the Graph's Key Features:

  1. The graph has a vertical asymptote at x=0x = 0, suggesting it is a logarithmic function shifted horizontally to the right by h=0h = 0 (no horizontal shift).
  2. The function appears to decrease as xx increases, indicating it might be a transformed logarithmic function with a negative coefficient.
  3. The function goes through the y-axis at around y=8y = 8, which can help determine the exact form.

Given these observations, a possible function that fits this graph could be:

f(x)=ln(x)+kf(x) = -\ln(x) + k

To find the exact value of kk, use the point where the graph crosses the y-axis. Suppose that when x=1x = 1, f(x)8f(x) \approx 8. Substituting into the equation:

8=ln(1)+k8 = -\ln(1) + k

Since ln(1)=0\ln(1) = 0:

k=8k = 8

Final Equation

The equation for the graph appears to be:

f(x)=ln(x)+8f(x) = -\ln(x) + 8

Would you like further details, or have any questions about this solution?


Here are five additional questions to explore this topic further:

  1. How would the graph change if the coefficient of ln(x)\ln(x) were positive instead of negative?
  2. What effect would a horizontal shift (hh value) have on this logarithmic function?
  3. How does changing the value of kk affect the graph's vertical position?
  4. What is the domain of the function f(x)=ln(x)+8f(x) = -\ln(x) + 8?
  5. Can you determine the range of this function based on the given graph?

Tip: When analyzing functions graphically, look for key points like intercepts, asymptotes, and overall shape to identify the type of function and transformations involved.

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Math Problem Analysis

Mathematical Concepts

Logarithmic Functions
Transformations of Functions

Formulas

f(x) = a * ln(b * (x - h)) + k

Theorems

Properties of Logarithmic Functions

Suitable Grade Level

Grades 10-12