Use an iPad® if you want your students to graph parabolas with ease and grasp vocabulary quickly. The Free Graphing Calculator app can be downloaded to explore axis of symmetry, roots, maxima, minima, ...

Two lines, each determined by two points, as Euclid predicted, are tangent to a parabola. Point A is located at ( 4, 20 ), point B is located at ( 14, 25 ) and intersection C is at ( 9, 10 ). Given ...