finding the domain and ranges

Question

For

​f(x)=2

and

​g(x)=3x2+1​,

find the domains and ranges of​ f, g,

fg​,

and

gf.

Select the correct choice for the domain of f below and fill in the answer box to complete your choice.

A.

The domain is an interval. The domain is

___

​(Type your answer in interval​ notation.)

B.

The domain is a list of values. The domain is

​____

​(Use a comma to separate answers as​ needed.)

I honestly dont understand this question

Answer 1

f(x) = 2

Domain: {2}

Range: {2}

g(x) = 3x² + 1

Domain: ℜ (all real numbers)

Range: ℜ (all real numbers)

f o g(x) does not exist

g o f(x) = 3(2)² + 1

Domain: {2}

Range: {13}