Click the following window once and drag the dot at the 'slider' to make changes.
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)

Example

Case 2: y = f(x + h)

Click the following window once and drag the dot at the 'slider' to make changes.
Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)

Example

Also read "the graph of y = f(|x|)"

http://www.hkedcity.net/ihouse_tools/forum/read.phtml?forum_id=27877¤t_page=&i=913693&t=913693

Please go to my blog for further discussion.