This webpage checks how well you understand parabolas, i.e. graphs of the quadratic equation y = ax^2+bx+c. Any such equation can be rewritten in the form y = a(xh)^2 + k using a procedure called completing the square. Below is a graph of a parabola for specific values of a, h, k. Your aim is to find these values and plot the graph of the same function.
This page requires IE+SVGviewer 3.01
or Mozilla+SVG
For another example click When you are done, you can print this page (in landscape mode). 
