- 1 Relations and Functions
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Relations and Functions
A relation is defined to be any set of ordered pairs.
Representation of Relations
- Set Notation
- Mapping Diagram
A relation in which corresponding to every input , there is only one output is called a function.
The symbol f(x) is read as "the value of f at x" or simply " f of x " . It doesnot mean f times x. f(x) is called the function notation.
Evaluating a Function
Consider the function f(x) .To evaluate f(a)
- Replace all x`s witha in the definition of f(x)
- Simplify the expression
Example : Let f(x) = 2x -3 .Find f(-1)
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