1-(81/x^4)=0

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Solution for 1-(81/x^4)=0 equation: 


D( x )

x^4 = 0

x^4 = 0

x^4 = 0

1*x^4 = 0 // : 1

x^4 = 0

x = 0

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

1-(81/(x^4)) = 0

1-81*x^-4 = 0

-81*x^-4 = -1 // : -81

x^-4 = 1/81

-4 < 0

1/(x^4) = 1/81 // * x^4

1 = 1/81*x^4 // : 1/81

81 = x^4

x^4 = 81 // ^ 1/4

abs(x) = 3

x = 3 or x = -3

x in { 3, -3 }

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