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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
2/u-5 = (6/3)*u-15-4 // - (6/3)*u-15-4
2/u-((6/3)*u)-5+4+15 = 0
2/u-2*u-5+4+15 = 0
2*u^-1-2*u^1+14*u^0 = 0
(14*u^1-2*u^2+2*u^0)/(u^1) = 0 // * u^2
u^1*(14*u^1-2*u^2+2*u^0) = 0
u^1
14*u-2*u^2+2 = 0
14*u-2*u^2+2 = 0
DELTA = 14^2-(-2*2*4)
DELTA = 212
DELTA > 0
u = (212^(1/2)-14)/(-2*2) or u = (-212^(1/2)-14)/(-2*2)
u = (2*53^(1/2)-14)/(-4) or u = (-2*53^(1/2)-14)/(-4)
u in { (2*53^(1/2)-14)/(-4), (-2*53^(1/2)-14)/(-4)}
u in { (2*53^(1/2)-14)/(-4), (-2*53^(1/2)-14)/(-4) }
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