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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
54/c-c-1+15+49 = 63 // - 63
54/c-c-63-1+15+49 = 0
54*c^-1-1*c^1 = 0
(54*c^0-1*c^2)/(c^1) = 0 // * c^2
c^1*(54*c^0-1*c^2) = 0
c^1
54-c^2 = 0
54-c^2 = 0
DELTA = 0^2-(-1*4*54)
DELTA = 216
DELTA > 0
c = (216^(1/2)+0)/(-1*2) or c = (0-216^(1/2))/(-1*2)
c = -3*6^(1/2) or c = 3*6^(1/2)
c in { -3*6^(1/2), 3*6^(1/2)}
c in { -3*6^(1/2), 3*6^(1/2) }
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