1/9=x^-2

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Solution for 1/9=x^-2 equation: 


D( x )

x = 0

x = 0

x = 0

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

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

1/9-x^-2 = 0

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

x^-2 = 1/9

-2 < 0

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

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

9 = x^2

x^2 = 9 // ^ 1/2

abs(x) = 3

x = 3 or x = -3

x in { 3, -3 }

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