y=-4,9x²+50x-97,5 | ausklammern
y=-4,9[x²+(-500/49)x]-97,5 | quadratische ergänzung +((-500/49)/2)²
y=-4,9[x²+(-500/49)x+(62500/2401)-(62500/2401)]-97,5 | 1. bino formel
y=-4,9[(x+31250/2401)²-(62500/2401)]-97,5 | ausklammern
y=-4,9[x+(31250/2401)]²-(6250/49)-97,5 |kürzen
y=-4,9[x+(31250/2401)]²-(6250/49)-97,488 |kürzen
y=-4,9[x+(31250/2401)]²-84,47258975