1/x2=9

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Solution for 1/x2=9 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/(x^2) = 9 // - 9

1/(x^2)-9 = 0

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

x^-2 = 9

-2 < 0

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

1 = 9*x^2 // : 9

1/9 = x^2

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

abs(x) = 1/3

x = 1/3 or x = -1/3

x in { 1/3, -1/3 }

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