The domain and the range of a function, are the set of values the function can take as input and output.
The domain and the range of [tex]\mathbf{f(x) = 21}[/tex] are:[tex]\mathbf{(-\infty,\infty)}[/tex] and 21, respectively.
The function is given as:
[tex]\mathbf{f(x) = 21}[/tex]
There is no restriction as to the value of x.
So, the domain is:
[tex]\mathbf{Domain = (-\infty,\infty)}[/tex]
Irrespective of what the value of x is, the value of y will remain 21.
So, the range is;
[tex]\mathbf{Range = 21}[/tex]
Hence, the domain and the range of [tex]\mathbf{f(x) = 21}[/tex] are:[tex]\mathbf{(-\infty,\infty)}[/tex] and 21, respectively.
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