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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(2/5)*w+3/w+4 = 0
2/5*w^1+3*w^-1+4*w^0 = 0
(2/5*w^2+4*w^1+3*w^0)/(w^1) = 0 // * w^2
w^1*(2/5*w^2+4*w^1+3*w^0) = 0
w^1
(2/5)*w^2+4*w+3 = 0
(2/5)*w^2+4*w+3 = 0
DELTA = 4^2-(3*4*(2/5))
DELTA = 56/5
DELTA > 0
w = ((56/5)^(1/2)-4)/(2*(2/5)) or w = (-(56/5)^(1/2)-4)/(2*(2/5))
w = 5/4*((56/5)^(1/2)-4) or w = -5/4*((56/5)^(1/2)+4)
w in { -5/4*((56/5)^(1/2)+4), 5/4*((56/5)^(1/2)-4)}
w in { -5/4*((56/5)^(1/2)+4), 5/4*((56/5)^(1/2)-4) }
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