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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(5/2)*y+8/y = 1 // - 1
(5/2)*y+8/y-1 = 0
5/2*y^1+8*y^-1-1*y^0 = 0
(5/2*y^2-1*y^1+8*y^0)/(y^1) = 0 // * y^2
y^1*(5/2*y^2-1*y^1+8*y^0) = 0
y^1
(5/2)*y^2-y+8 = 0
(5/2)*y^2-y+8 = 0
DELTA = (-1)^2-(4*8*(5/2))
DELTA = -79
DELTA < 0
y in { }
y belongs to the empty set
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