Math Problem Statement
What are the domain and range of f(x) = -log_5(x + 2)?
Solution
The question asks for the domain and range of the function .
Domain:
- The logarithmic function is only defined for . For this particular function, , the argument must be greater than 0.
- So, implies .
- Therefore, the domain is .
Range:
- The function involves a logarithmic expression. The logarithmic function typically has a range of all real numbers, but since there's a negative sign in front of the logarithm, it reflects the graph across the x-axis.
- Thus, the range remains all real numbers.
Conclusion:
The correct answer is: A: Domain: , Range: all real numbers.
Would you like a detailed explanation or further clarifications?
Here are 5 related questions for further exploration:
- How do you determine the domain of any logarithmic function?
- What happens to the range of a function if it is multiplied by a negative number?
- How would the domain and range change if the function was ?
- What is the effect of different logarithmic bases on the graph of a logarithmic function?
- How does a horizontal or vertical shift affect the domain of logarithmic functions?
Tip: Remember, the domain of a logarithmic function is always determined by the condition that the argument of the logarithm must be strictly greater than zero.
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Math Problem Analysis
Mathematical Concepts
Logarithmic Functions
Domain and Range
Formulas
f(x) = -log_b(x)
Domain condition: x + 2 > 0
Theorems
Properties of Logarithmic Functions
Reflection of Functions
Suitable Grade Level
Grades 9-11