Question

What is the domain and range of `y = x^2 - 7`?

Answer 1

Domain is R, set of real numbers and Range is the set of real numbers greater or equal than -7

Explanation:

Domain is R, set of real numbers

Range is the domain of inverse function

`x=+-sqrt(y+7)`

it must be
`y+7>=0`
`y>=-7`

Therefore Range is the set of real numbers greater or equal than -7