1-81/x^2=0

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Solution for 1-81/x^2=0 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)

1-(81/(x^2)) = 0

1-81*x^-2 = 0

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

x^-2 = 1/81

-2 < 0

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

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

81 = x^2

x^2 = 81 // ^ 1/2

abs(x) = 9

x = 9 or x = -9

x in { 9, -9 }

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