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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
2-1/u = (5/2)*u+4+4 // - (5/2)*u+4+4
2-((5/2)*u)-1/u-4-4 = 0
(-5/2)*u-1/u-4-4+2 = 0
-5/2*u^1-1*u^-1-6*u^0 = 0
(-5/2*u^2-6*u^1-1*u^0)/(u^1) = 0 // * u^2
u^1*(-5/2*u^2-6*u^1-1*u^0) = 0
u^1
(-5/2)*u^2-6*u-1 = 0
(-5/2)*u^2-6*u-1 = 0
DELTA = (-6)^2-(-1*4*(-5/2))
DELTA = 26
DELTA > 0
u = (26^(1/2)+6)/(2*(-5/2)) or u = (6-26^(1/2))/(2*(-5/2))
u = (26^(1/2)+6)/(-5) or u = (6-26^(1/2))/(-5)
u in { (26^(1/2)+6)/(-5), (6-26^(1/2))/(-5)}
u in { (26^(1/2)+6)/(-5), (6-26^(1/2))/(-5) }
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