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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
(-1/2)*u+2+8 = 4-8/u // - 4-8/u
(-1/2)*u-(-8/u)-4+2+8 = 0
(-1/2)*u+8*u^-1-4+2+8 = 0
8*u^-1-1/2*u^1+6*u^0 = 0
(6*u^1-1/2*u^2+8*u^0)/(u^1) = 0 // * u^2
u^1*(6*u^1-1/2*u^2+8*u^0) = 0
u^1
(-1/2)*u^2+6*u+8 = 0
(-1/2)*u^2+6*u+8 = 0
DELTA = 6^2-(4*8*(-1/2))
DELTA = 52
DELTA > 0
u = (52^(1/2)-6)/(2*(-1/2)) or u = (-52^(1/2)-6)/(2*(-1/2))
u = 6-(2*13^(1/2)) or u = 6-(-2*13^(1/2))
u in { 6-(2*13^(1/2)), 6-(-2*13^(1/2))}
u in { 6-(2*13^(1/2)), 6-(-2*13^(1/2)) }
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