(2x-1/x^2-2x-3)

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Solution for (2x-1/x^2-2x-3) 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)

2*x-(2*x)-(1/(x^2))-3 = 0

2*x-2*x-x^-2-3 = 0

-1*x^-2 = 3 // : -1

x^-2 = -3

-2 < 0

1/(x^2) = -3 // * x^2

1 = -3*x^2 // : -3

-1/3 = x^2

x belongs to the empty set

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