What is notational function?

Answer 1

Function notation is a way to name a

function that is defined by an equation. For an equation in x

and y, the symbol f (x) replaces y and is read as "the value

of f at x" or simply as "f of x."

Answer 2

It is taking an equation, say y = mx + b, and replacing y with f(x). It is used to help people understand that y is determined from the value of x.

Answer 3

f(x)=2x+1

f(3+1)=f(3)+f(1)