Question: what is the square root of x a function?
Answer: For example : If x=9, then the square root is + 3 or-3. The definition of a function is this : A function is a set of ordered pairs ,(x, f(x)), such that for any x in the domain ,there can be at most, one value of f(x). This implies that f(x) does not necessarily need to be defined, such as ,for example, 1/x, when x=0.