You need to know the domain in order to find the range.
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It is the function for which all the elements of the range of the function corresponds to exactly one element of the domain.
it is a function to where every element in the range equals exactly one element in the range, or for every x there is exactly one f(x)
y is a function of x iffor each value of x (in the domain) there is a value of y, andfor each value of y (in the range) there is at most one value of x.
A function is a relationship that is one-to-one or many-to-one but not one-to-many. Thus, if a and b are in the domain of the function, then their images in the range, f(a) and f(b) MUST be equal.
A relationship is a function if every element in the domain is mapped onto only one element in the codomain (range). In graph terms, it means that any line parallel to the vertical axis can meet the graph in at most one point.