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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
157/w = 2*w-5 // - 2*w-5
157/w-(2*w)+5 = 0
157/w-2*w+5 = 0
157*w^-1-2*w^1+5*w^0 = 0
(5*w^1-2*w^2+157*w^0)/(w^1) = 0 // * w^2
w^1*(5*w^1-2*w^2+157*w^0) = 0
w^1
5*w-2*w^2+157 = 0
5*w-2*w^2+157 = 0
DELTA = 5^2-(-2*4*157)
DELTA = 1281
DELTA > 0
w = (1281^(1/2)-5)/(-2*2) or w = (-1281^(1/2)-5)/(-2*2)
w = (1281^(1/2)-5)/(-4) or w = (1281^(1/2)+5)/4
w in { (1281^(1/2)-5)/(-4), (1281^(1/2)+5)/4}
w in { (1281^(1/2)-5)/(-4), (1281^(1/2)+5)/4 }
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