Răspunsuri

2014-08-26T14:23:09+03:00
Varful parabolei are coordonatele:
V(-b/2a;-Δ/4a)=V(-2/4;4/8)=V(-1/2;1/2)
Deoarece x+y=-1/2+1/2=0 => V∈ dreptei x+y=0