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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(-1/2)*w+1+8 = 4-8/w // - 4-8/w
(-1/2)*w-(-8/w)-4+1+8 = 0
(-1/2)*w+8*w^-1-4+1+8 = 0
8*w^-1-1/2*w^1+5*w^0 = 0
(5*w^1-1/2*w^2+8*w^0)/(w^1) = 0 // * w^2
w^1*(5*w^1-1/2*w^2+8*w^0) = 0
w^1
(-1/2)*w^2+5*w+8 = 0
(-1/2)*w^2+5*w+8 = 0
DELTA = 5^2-(4*8*(-1/2))
DELTA = 41
DELTA > 0
w = (41^(1/2)-5)/(2*(-1/2)) or w = (-41^(1/2)-5)/(2*(-1/2))
w = 5-41^(1/2) or w = 41^(1/2)+5
w in { 5-41^(1/2), 41^(1/2)+5}
w in { 5-41^(1/2), 41^(1/2)+5 }
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