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x=-b/2a
x=-(-1)/2x(-1)
x=1/-2
x=-1/2
y=-delta/4a
delta=b^2-4ac
delta=(-1)^2-4x(-1)x6=1+24=25
y=-25/4x(-1)
y=-25/-4
y=6 i 1/4
współrzędne wierzchołka (-1/2;6 i 1/4)