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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
k+10/k = 4/6 // - 4/6
k+10/k-(4/6) = 0
k+10/k-2/3 = 0
1*k^1+10*k^-1-2/3*k^0 = 0
(1*k^2-2/3*k^1+10*k^0)/(k^1) = 0 // * k^2
k^1*(1*k^2-2/3*k^1+10*k^0) = 0
k^1
k^2+(-2/3)*k+10 = 0
k^2+(-2/3)*k+10 = 0
DELTA = (-2/3)^2-(1*4*10)
DELTA = -356/9
DELTA < 0
k in { }
k belongs to the empty set
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