User:Lizynavin/My sandbox/Maths

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Relations and Functions


A relationis defined to be any set of ordered pairs.


Representation of Relations

  • Set Notation   
  • Mapping Diagram
  • Tables
  • Graph


A relation in which corresponding to every input there is only one output is called a function.

Function Notation

The symbol f(x) is read as  "the value of f atx"  or simply " f of x "  . It doesnot mean f  times x. f(x) is called the <u>function notation.

Evaluating a Function

Consider the  function f(x) .To evaluate f(a)

  1. Replace all x`s witha in the definition of f(x)
  2. Simplify the expression

Example : Let f(x) = 2x -3 .Find f(-1)

Solution :f(-1) = 2(-1) -3

                          = -2-3

                          = -5