press a, to change a. press c, to change c. press SPACE, to create the parabola. you can switch between negativ and positiv parabolas. hold h to hide the dots. Click and drag the points A to D, to find out, on witch points is the parabola. press m, to move a ponit with arrowkeys.Press SPACE, to stop control. Press P, to see the positions of the points A- D. Press X,to change the xpos in point S(f(x)=(a+x)²+c) Press S, to switch between f(x)=ax²+c and f(x)=(a+x)²+c.
