Math Problem Statement
Which graph shows y = log2 x?
Solution
The question asks which graph represents the function .
Key characteristics of the logarithmic function :
- Domain: The function is only defined for , so the graph must be entirely to the right of the y-axis.
- Vertical asymptote: There is a vertical asymptote at , meaning the curve approaches but never touches or crosses the y-axis.
- Shape: The logarithmic graph increases slowly for larger values of but rapidly decreases near 0 on the positive x-axis.
- Intercept: The graph will pass through because .
Looking at the four graphs:
- Top left: This graph is defined for negative x-values and approaches the x-axis from the left, which doesn't match a logarithmic function.
- Top right: This is an exponential curve, not a logarithmic curve.
- Bottom left: This is also incorrect as it represents a negative logarithmic-like shape.
- Bottom right: This graph fits the description of , defined only for , with a vertical asymptote at , and passing through .
Thus, the correct graph is the bottom right one.
Would you like more details or have any questions?
Here are five related questions to explore:
- How does the base of a logarithm affect the shape of its graph?
- What is the inverse of the function ?
- Can you explain the domain and range of logarithmic functions?
- How would the graph of compare to ?
- What happens to the graph of if you add a constant to the function (e.g., )?
Tip: When sketching logarithmic graphs, always check for the vertical asymptote at and where the function crosses the x-axis (at ).
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Math Problem Analysis
Mathematical Concepts
Logarithmic Functions
Graphs of Functions
Asymptotes
Formulas
y = log_b x (for general logarithmic functions)
y = log2 x (specific case)
Theorems
Properties of Logarithmic Functions
Vertical Asymptote of Logarithmic Graphs
Suitable Grade Level
Grades 10-12