Math Problem Statement

Graph the function f(x) = log_(1/2)(x + 1) - 2.

Solution

To graph the function f(x)=log12(x+1)2f(x) = \log_{\frac{1}{2}}(x + 1) - 2, follow these steps:

  1. Understand the Components:

    • log12(x+1)\log_{\frac{1}{2}}(x + 1): This is a logarithmic function with base 12\frac{1}{2}. The logarithm with a base less than 1 is a decreasing function.
    • 2-2: This is a vertical shift downward by 2 units.
  2. Identify Key Points:

    • The domain of the function is x+1>0x>1x + 1 > 0 \Rightarrow x > -1.
    • The vertical asymptote is at x=1x = -1.
    • When x=0x = 0, f(x)=log12(1)2=02=2f(x) = \log_{\frac{1}{2}}(1) - 2 = 0 - 2 = -2.
    • When x=1x = 1, f(x)=log12(2)2=12=3f(x) = \log_{\frac{1}{2}}(2) - 2 = -1 - 2 = -3.
  3. Graphing Steps:

    • Draw the vertical asymptote at x=1x = -1.
    • Plot the point (0, -2).
    • Plot the point (1, -3).
    • As xx approaches 1-1 from the right, f(x)f(x) approaches \infty.
    • As xx increases, f(x)f(x) decreases without bound, but at a decreasing rate.
  4. Sketch the Graph:

    • Start near the vertical asymptote at x=1x = -1 and draw the curve approaching infinity as xx approaches 1-1 from the right.
    • Pass through the points (0, -2) and (1, -3).
    • Continue the curve downward as xx increases, showing the decreasing nature of the logarithmic function.

Let's create a graph based on these details:

Graph

Would you like further details or have any questions? Here are some relative questions for deeper understanding:

  1. What is the effect of the base of a logarithmic function on its graph?
  2. How do vertical shifts affect the graph of a function?
  3. What are vertical asymptotes, and how are they determined for logarithmic functions?
  4. How do you find the domain of a logarithmic function?
  5. What are the general characteristics of logarithmic functions with bases less than 1?

Tip: Always check the domain of the logarithmic function before graphing, as it defines where the function is valid.

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Math Problem Analysis

Mathematical Concepts

Logarithmic Functions
Transformations of Functions
Graphing

Formulas

f(x) = log_b(x + c) + d

Theorems

Properties of Logarithmic Functions
Transformations of Logarithmic Graphs

Suitable Grade Level

Grades 10-12