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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1 = -(3/x-9)^2-4/x-9 // + -(3/x-9)^2-4/x-9
(3/x-9)^2-(-4/x)+1+9 = 0
(3/x-9)^2+4*x^-1+1+9 = 0
(3*x^-1-9)^2+4/x+1+9 = 0
(x*(3*x^-1-9)^2)/x+4/x+(1*x)/x+(9*x)/x = 0
x*(3*x^-1-9)^2+1*x+9*x+4 = 0
81*x+x+9*x+9*x^-1-50 = 0
82*x+9*x+9*x^-1-50 = 0
91*x+9*x^-1-50 = 0
91*x+9*x^-1-50 = 0
91*x^1+9*x^-1-50*x^0 = 0
(91*x^2-50*x^1+9*x^0)/(x^1) = 0 // * x^2
x^1*(91*x^2-50*x^1+9*x^0) = 0
x^1
91*x^2-50*x+9 = 0
91*x^2-50*x+9 = 0
DELTA = (-50)^2-(4*9*91)
DELTA = -776
DELTA < 0
x in { }
1 = 0
1/x = 0
1/x = 0 // * x
1 = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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