I'm going to guess that the instructions are "Find the domain of the following function, and state your answer using interval notation." But I'm afraid I can't guess what the function is supposed to be...?
To format a square root, use the "sqrt()" notation, using grouping symbols to make your meaning clear. For instance, "the square root of nine equals three" would look like "sqrt(9) = 3", and "the square root of the sum of x<sup>2</sup> and four" would look like "sqrt(x<sup>2</sup> + 4)".
Thank you.
Eliz.