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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4*k+2/k = 2 // - 2
4*k+2/k-2 = 0
4*k^1+2*k^-1-2*k^0 = 0
(4*k^2-2*k^1+2*k^0)/(k^1) = 0 // * k^2
k^1*(4*k^2-2*k^1+2*k^0) = 0
k^1
4*k^2-2*k+2 = 0
4*k^2-2*k+2 = 0
DELTA = (-2)^2-(2*4*4)
DELTA = -28
DELTA < 0
k in { }
k belongs to the empty set
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