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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-2*x-(1/x)-1 = x+1 // - x+1
-2*x-x-(1/x)-1-1 = 0
-2*x-x-x^-1-1-1 = 0
-3*x^1-1*x^-1-2*x^0 = 0
(-3*x^2-2*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(-3*x^2-2*x^1-1*x^0) = 0
x^1
-3*x^2-2*x-1 = 0
-3*x^2-2*x-1 = 0
DELTA = (-2)^2-(-3*(-1)*4)
DELTA = -8
DELTA < 0
x in { }
x belongs to the empty set
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