Question
Given functions
and
, state the domains of the following functions using
interval notation.
Domain of
Domain of
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:
-
Functions Given:
-
-
Composition
: -
-
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:
- The expression inside the square root,
-
Interval Notation:
- Combining the solutions, the domain of
is:
- Combining the solutions, the domain of
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