Quadratic functions, jQuery, PHP and jpgraph
The quadratic function is a basic mathematical unit of the parabola.
Variable a determines the height and direction of an arc across the x-axis.
b determines the start or end point of the arc on the y-axis.
c determines the position of the arc in relation to the y-axis.
x min and x max are the end points of the arc on the x-axis, and x step determines the accuracy of the curve described.
The roots, if any, describe the points at which the arc crosses the y-axis.
Try varying the values of the function to see the effect on the resulting parabolae.
f(x) = ax2+bx+c