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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
2 = u-(35/u) // - u-(35/u)
35/u-u+2 = 0
35*u^-1-1*u^1+2*u^0 = 0
(2*u^1-1*u^2+35*u^0)/(u^1) = 0 // * u^2
u^1*(2*u^1-1*u^2+35*u^0) = 0
u^1
2*u-u^2+35 = 0
2*u-u^2+35 = 0
DELTA = 2^2-(-1*4*35)
DELTA = 144
DELTA > 0
u = (144^(1/2)-2)/(-1*2) or u = (-144^(1/2)-2)/(-1*2)
u = -5 or u = 7
u in { -5, 7}
u in { -5, 7 }
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