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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4-5/w = (-3/4)*w+1+16 // - (-3/4)*w+1+16
4-((-3/4)*w)-5/w-16-1 = 0
(3/4)*w-5/w-16-1+4 = 0
3/4*w^1-5*w^-1-13*w^0 = 0
(3/4*w^2-13*w^1-5*w^0)/(w^1) = 0 // * w^2
w^1*(3/4*w^2-13*w^1-5*w^0) = 0
w^1
(3/4)*w^2-13*w-5 = 0
(3/4)*w^2-13*w-5 = 0
DELTA = (-13)^2-(-5*4*(3/4))
DELTA = 184
DELTA > 0
w = (184^(1/2)+13)/(2*(3/4)) or w = (13-184^(1/2))/(2*(3/4))
w = 2/3*(2*46^(1/2)+13) or w = 2/3*(13-2*46^(1/2))
w in { 2/3*(13-2*46^(1/2)), 2/3*(2*46^(1/2)+13)}
w in { 2/3*(13-2*46^(1/2)), 2/3*(2*46^(1/2)+13) }
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