# Math Help - Domain and range

1. ## Domain and range

hey guys i know this sounds like an easy question but isn't the domain of x^2+7 (-infinity,infinity)?

2. Originally Posted by Asuhuman18
hey guys i know this sounds like an easy question but isn't the domain of x^2+7 (-infinity,infinity)?
Yes. But if you want to find an inverse function of this function then this domain will need to be restricted to make the function 1-to-1.

3. no this is the inverse function. the normal funtion was y=sqrt(x-7). I am pretty sure this is right but my online hw is rejecting it

4. Originally Posted by Asuhuman18
no this is the inverse function. the normal funtion was y=sqrt(x-7). I am pretty sure this is right but my online hw is rejecting it
Well then, the inverse relation will be $y = {\color{red}\pm} \sqrt{x - 7}$.