Question

How do you find the domain and range for `y=x^2=9`?

Answer 1

**As written **
`color(white)("XXXX")`Since `x^2 = 9 rarr x=+-3`
`color(white)("XXXX")` `color(white)("XXXX")`the Domain is `{-3,+3}`
`color(white)("XXXX")`and since `y=x`
`color(white)("XXXX")` `color(white)("XXXX")`the Range is also `{-3,+3}`

Probable Intended equation: `y = x^2-9`
`color(white)("XXXX")`In this case the equation is defined for all Real values of `x`,
`color(white)("XXXX")` `color(white)("XXXX")` so the Domain is `x epsilon RR`
`color(white)("XXXX")`the minimum value for `y` is `y=-9`,
`color(white)("XXXX")` `color(white)("XXXX")`so the Range is `y epsilon [-9,+oo)`