Answer:

And we want to find the domain. And that represent the possible values for x. Since we have a quadratic function we have that the domain would be all the reals, and we can write:
![D= [x \in R]](https://tex.z-dn.net/?f=%20D%3D%20%5Bx%20%5Cin%20R%5D)
Where D represent the domain and R the set of the real numbers.
Step-by-step explanation:
For this case we have the following function:

And we want to find the domain. And that represent the possible values for x. Since we have a quadratic function we have that the domain would be all the reals, and we can write:
![D= [x \in R]](https://tex.z-dn.net/?f=%20D%3D%20%5Bx%20%5Cin%20R%5D)
Where D represent the domain and R the set of the real numbers.