Math Problem Statement

Use the function y = log3(x - 5) - 2 to answer the following questions: (a) Use transformations of the graph of y = log3 x to graph the given function. (b) Write the domain and range in interval notation. (c) Write an equation of the asymptote.

Solution

To analyze the problem based on the function y=log3(x5)2y = \log_3(x - 5) - 2 and address each part:

(a) Transformations of the graph of y=log3xy = \log_3 x:

  1. Horizontal Shift: The function has (x5)(x - 5) inside the logarithm, indicating a shift 5 units to the right.
  2. Vertical Shift: The 2-2 outside the logarithm moves the graph down by 2 units.

These transformations should be applied to y=log3xy = \log_3 x to graph y=log3(x5)2y = \log_3(x - 5) - 2.

(b) Domain and Range:

  • Domain: Since x5>0x - 5 > 0, the domain is x>5x > 5. In interval notation, this is (5,)(5, \infty).
  • Range: Since logarithmic functions are defined for all real values of yy, the range is (,)(-\infty, \infty).

(c) Equation of the Asymptote:

  • The vertical asymptote for the function occurs where the argument of the logarithm is zero. So, x5=0x=5x - 5 = 0 \Rightarrow x = 5.

Therefore, the equation of the asymptote is x=5x = 5.

Would you like further details on any specific part, or have additional questions?


  1. What other transformations could be applied to a logarithmic function?
  2. How does the base of the logarithm affect the shape of the graph?
  3. What changes would occur if the vertical shift were positive instead of negative?
  4. How would a reflection over the x-axis appear on the graph of a logarithmic function?
  5. What happens to the domain if the logarithmic function is log3(x+5)\log_3(x + 5) instead?

Tip: Always identify the base of the logarithm when analyzing transformations, as it affects the rate of increase.

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Math Problem Analysis

Mathematical Concepts

Logarithmic Functions
Graph Transformations
Domain and Range
Asymptotes

Formulas

y = log_b(x - c) + d

Theorems

Properties of Logarithmic Functions

Suitable Grade Level

Grades 10-12