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koordinat titik balik:
x = -b/2a
x = -(-7)/2(2)
x = 7/4
y = D/-4a
y = b²-4ac/-4a
y = (-7)²-4.2.6/-4.2
y = 49-48/-8
y = -1/8
koordinatnya: (x,y) = (7/4 , -1/8)