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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
(7/3)*k+1/k = -4 // + 4
(7/3)*k+1/k+4 = 0
7/3*k^1+1*k^-1+4*k^0 = 0
(7/3*k^2+4*k^1+1*k^0)/(k^1) = 0 // * k^2
k^1*(7/3*k^2+4*k^1+1*k^0) = 0
k^1
(7/3)*k^2+4*k+1 = 0
(7/3)*k^2+4*k+1 = 0
DELTA = 4^2-(1*4*(7/3))
DELTA = 20/3
DELTA > 0
k = ((20/3)^(1/2)-4)/(2*(7/3)) or k = (-(20/3)^(1/2)-4)/(2*(7/3))
k = 3/14*((20/3)^(1/2)-4) or k = -3/14*((20/3)^(1/2)+4)
k in { -3/14*((20/3)^(1/2)+4), 3/14*((20/3)^(1/2)-4)}
k in { -3/14*((20/3)^(1/2)+4), 3/14*((20/3)^(1/2)-4) }
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