Question

what is a function?

Answer 1

a function is a relation between a set of inputs and a set of potential outputs with the property that each input is related to exactly one output.An example of such a relation is defined by the rule f(x) = x2, which relates an input x to its square, which are both real numbers. The output of the function f corresponding to an input x is denoted by f(x) (read "f of x"). If the input is –3, then the output is 9, and we may write f(–3) = 9.