9/x^2+81

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Solution for 9/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)

9/(x^2)+81 = 0

9*x^-2 = -81 // : 9

x^-2 = -9

-2 < 0

1/(x^2) = -9 // * x^2

1 = -9*x^2 // : -9

-1/9 = x^2

x belongs to the empty set

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