You know that most of the times whenever there is any complex topic is to be explained by the teacher he does it with the help of diagrams, because as a human being we are more friendly with graphical procedure of explaining than the oral.
Enter, in the text area provided above, the function or functions you want to graph. All functions must use x as their independent variable. Enter functions in standard mathematical notation, using parentheses and spaces as you wish for clarity. Use / for division and ^ for exponentiation. You may use * to indicate multiplication or simply put terms to be multiplied next to each other, like 2x. You can enter more than one function by separating functions with semicolons (;).
In the old days, you were pretty much limited to a handheld graphing calculator in order to produce graphs of equations. That has all changed in the past few years with the introduction of online graphing calculators.