Example QF.0:  Suppose $y$ is a function of $x$ given by the equation $f(x) = x^2 - 2x - 3$.
$x$
$f(x) = x^2 - 2x - 3$
3
0
2
-3
1
-4
0
-3
-1
0
-2
5
-3
12
Table QF1 
Graph of f(x) = x^2-2x-3Graph QF1
Mapping Diagram for f(x) = 2x+3
Diagram QF1 




Table QF1 shows a selection of the values this function relates.

Graph QF1shows the graph of the table values of the function $f$ as well as the visualization of the graph of (all the values of) the function for the interval domain $[-3,3])$.

Diagram QF1 shows the mapping diagram of the table values of the function $f$.