Question
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Given functions and , state the domains of the following functions using
interval notation.
Domain of
Domain of

Ask by Frazier Weaver. in the United States
Jan 27,2025

Upstudy AI Solution

Tutor-Verified Answer

Answer

The domain of is .

Solution

To determine the domain of , let’s break down the functions involved:
  1. Functions Given:
  2. Composition :
  3. Determining the Domain:
    • The expression inside the square root, , must be positive because the square root of a non-positive number is undefined in the real number system.
    • So, we set up the inequality:
    • Solving the inequality:
  4. Interval Notation:
    • Combining the solutions, the domain of is:
Final Answer:
The domain of is .

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Extra Insights

To find the domain of , we first need to determine the range of . The function is a quadratic function that opens upwards, with its vertex at . The minimum value of is -4, which occurs when . Thus, will take values from to .
For the function , we require because the square root function is defined only for non-negative numbers, and we cannot take the square root of 0 when it is in the denominator.
Now we need for to be defined. Solving the inequality :
This factors as:
The solutions to this inequality are found by testing the intervals determined by the roots and . The function is positive for and .
Since we also have the restriction that must be greater than 0, we combine the intervals where with .
Thus, the domain of is in interval notation.
So to summarize:
Domain of

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