x^(2/3)=81

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Solution for x^(2/3)=81 equation: 


x in (-oo:+oo)

x^(2/3) = 81 // - 81

x^(2/3)-81 = 0

1*x^(2/3) = 81 // : 1

x^(2/3) = 81

x^(2/3) = 81 // ^ 3

x^2 = 531441 // ^ 1/2

abs(x) = 729

x = 729 or x = -729

x in { 729, -729 }

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