x^(-2)=4/9

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Solution for x^(-2)=4/9 equation: 


D( x )

x = 0

x = 0

x = 0

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

x^-2 = 4/9 // - 4/9

x^-2-(4/9) = 0

x^-2-4/9 = 0

1*x^-2 = 4/9 // : 1

x^-2 = 4/9

-2 < 0

1/(x^2) = 4/9 // * x^2

1 = 4/9*x^2 // : 4/9

9/4 = x^2

x^2 = 9/4 // ^ 1/2

abs(x) = 3/2

x = 3/2 or x = -3/2

x in { 3/2, -3/2 }

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