(x)=x-2/x^2-81

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Solution for (x)=x-2/x^2-81 equation: 


D( x )

x^2 = 0

x^2 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x in (-oo:0) U (0:+oo)

x = x-(2/(x^2))-81 // - x-(2/(x^2))-81

x-x+2/(x^2)+81 = 0

2*x^-2 = -81 // : 2

x^-2 = -81/2

-2 < 0

1/(x^2) = -81/2 // * x^2

1 = -81/2*x^2 // : -81/2

-2/81 = x^2

x belongs to the empty set

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