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c in (-oo:+oo)
2*c^2+12*c-(23/2) = 0
2*c^2+12*c-23/2 = 0
2*c^2+12*c-23/2 = 0
DELTA = 12^2-(-23/2*2*4)
DELTA = 236
DELTA > 0
c = (236^(1/2)-12)/(2*2) or c = (-236^(1/2)-12)/(2*2)
c = (2*59^(1/2)-12)/4 or c = (-2*59^(1/2)-12)/4
c in { (-2*59^(1/2)-12)/4, (2*59^(1/2)-12)/4 }
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