x → a*x² + b*x + c. Premi a / A per diminuire / aumentare "a"di 0.1. Analogamente premi  b / B  e  c / C. Press a/A to decrease/increase "a" by 0.1. Similarly press b/B and c/C. Press 2, 1, 0 to change the sign of a, b or c.

-10 <= x <= 10         -8 <= y <= 8