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Which of the following represents the domain and range for the logarithmic function below?

[tex]\( F(x) = \log_4 x \)[/tex]

A. The domain is [tex]\( x \ \textless \ 0 \)[/tex], and the range is all real numbers.
B. The domain is [tex]\( x \ \textgreater \ 0 \)[/tex], and the range is [tex]\( y \ \textgreater \ 0 \)[/tex].
C. The domain is [tex]\( x \ \textless \ 0 \)[/tex], and the range is [tex]\( y \ \textless \ 0 \)[/tex].
D. The domain is [tex]\( x \ \textgreater \ 0 \)[/tex], and the range is all real numbers.


Sagot :

To determine the domain and range of the logarithmic function [tex]\( F(x) = \log_4 x \)[/tex], let's analyze the properties of logarithmic functions.

### Domain:
The domain of any logarithmic function [tex]\( \log_b(x) \)[/tex] (where [tex]\( b > 1 \)[/tex]) is the set of all positive real numbers. This implies that [tex]\( x \)[/tex] must be greater than 0 because the logarithm of a non-positive number is undefined.

### Range:
The range of a logarithmic function is the set of all real numbers. This means that for any real number [tex]\( y \)[/tex], there exists some [tex]\( x > 0 \)[/tex] such that [tex]\( \log_b(x) = y \)[/tex].

Let's consider the options:

A. The domain is [tex]\( x < 0 \)[/tex], and the range is all real numbers.
- Incorrect: The domain [tex]\( x < 0 \)[/tex] is incorrect for a logarithmic function since [tex]\( x \)[/tex] must be positive.

B. The domain is [tex]\( x > 0 \)[/tex], and the range is [tex]\( y > 0 \)[/tex].
- Incorrect: While the domain is correct, the range [tex]\( y > 0 \)[/tex] is incorrect. The range of a logarithmic function includes all real numbers, not just positive numbers.

C. The domain is [tex]\( x < 0 \)[/tex], and the range is [tex]\( y < 0 \)[/tex].
- Incorrect: Both the domain and range are incorrect. The domain should be [tex]\( x > 0 \)[/tex] and the range should include all real numbers.

D. The domain is [tex]\( x > 0 \)[/tex], and the range is all real numbers.
- Correct: This option correctly states that the domain is [tex]\( x > 0 \)[/tex] and the range encompasses all real numbers.

Therefore, the correct answer is:
[tex]\[ \boxed{D} \][/tex]
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