Graph the following function. Based on the graph, state the domain and the range and find any intercepts.
What is the domain of the function? Select the correct choice below and, if necessary, fill in the answer box(es) to
complete your choice.
A. The domain is .
(Simplify your answer. Use a comma to separate answers as needed.)
B. The domain is
(Simplify your answer. Use a comma to separate answers as needed.)
C. The domain is , , .
(Simplify your answer. Use a comma to separate answers as needed.)
D. The domain is the set of all real numbers.
The range of the function is .
(Type your answer in interval notation.)
Since both pieces require (the logarithm is defined only for positive arguments), the overall domain is
Thus, the correct choice is A. The domain is .
Step 2. Determine the Range
For :
The function is
As , and hence .
As , and hence .
Since never reaches in this branch, the values of are greater than 0. Therefore, the range for this piece is
For :
The function is
At , .
As , and hence .
Thus, the range for this branch is
Overall Range:
Combining the two pieces, the range is
Step 3. Identify the Intercepts
x-intercept: Set .
In the second piece,
So the x-intercept is .
y-intercept: This would require , but since is not in the domain, there is no y-intercept.
Final Answers:
Domain:
Range:
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Bonus Knowledge
To graph the function , we need to evaluate each piece separately. For , the function is given by , which will approach as approaches from the left and approaches as approaches from the right. For , increases without bound.
Based on this, the domain of the function is the set , so the correct choice is A. The range is from to , which can be written in interval notation as .
As for intercepts, the function intersects the y-axis when , but since is not in the domain, there are no y-intercepts. The x-intercept occurs when (but this requires solving which may need more detail for specific values).