A function is a specific type of relation in which each domain value, or input, leads to exactly one range value, or output Function notation is a shorthand method for relating the input to the output in the form y = f ( x )

In tabular form, a function can be represented by rows or columns that relate to input and output values To evaluate a function, we determine an output value for a corresponding input value.

function — a relation in which each input value yields a unique output value. output — each object or value in the range that is produced when an input value is entered into a function. input — each object or value in a domain that relates to another object or value by a relationship known as a function. range — the set of output values that result from the input values in a relation.