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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
8*c+2/c-5 = 0
8*c^1+2*c^-1-5*c^0 = 0
(8*c^2-5*c^1+2*c^0)/(c^1) = 0 // * c^2
c^1*(8*c^2-5*c^1+2*c^0) = 0
c^1
8*c^2-5*c+2 = 0
8*c^2-5*c+2 = 0
DELTA = (-5)^2-(2*4*8)
DELTA = -39
DELTA < 0
c in { }
c belongs to the empty set
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