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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
1/4-((5/4)*k) = 5/k // - 5/k
1/4-((5/4)*k)-(5/k) = 0
(-5/4)*k-5*k^-1+1/4 = 0
1/4*k^0-5/4*k^1-5*k^-1 = 0
(1/4*k^1-5/4*k^2-5*k^0)/(k^1) = 0 // * k^2
k^1*(1/4*k^1-5/4*k^2-5*k^0) = 0
k^1
(-5/4)*k^2+(1/4)*k-5 = 0
(-5/4)*k^2+(1/4)*k-5 = 0
DELTA = (1/4)^2-(-5*4*(-5/4))
DELTA = -399/16
DELTA < 0
k in { }
k belongs to the empty set
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