Question

What is the domain and range of `y=7`?

Answer 1

Please read the explanation.

Explanation:

We have the function `color(red)(y=f(x)=7`

The graph of `color(blue)(f(x)=7` is given below:

Domain:

The function has neither undefined points nor domain constraints.

Hence, the domain is `-oo < x < oo`

Using the interval notation we can also write the domain as

`(-oo, oo)`

Range:

The range of a constant function `color(blue)(f(x)=a` is just `color(red)(a`.

Hence, the range is `color(blue)(f(x)=7`.

I hope it helps.