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c in (-oo:+oo)
8/3 = 4*c-c^2 // - 4*c-c^2
c^2-(4*c)+8/3 = 0
c^2-4*c+8/3 = 0
c^2-4*c+8/3 = 0
DELTA = (-4)^2-(1*8/3*4)
DELTA = 16/3
DELTA > 0
c = ((16/3)^(1/2)+4)/(1*2) or c = (4-(16/3)^(1/2))/(1*2)
c = ((16/3)^(1/2)+4)/2 or c = (4-(16/3)^(1/2))/2
c in { (4-(16/3)^(1/2))/2, ((16/3)^(1/2)+4)/2 }
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