81=1/n^4

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Solution for 81=1/n^4 equation: 


D( n )

n^4 = 0

n^4 = 0

n^4 = 0

1*n^4 = 0 // : 1

n^4 = 0

n = 0

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

81 = 1/(n^4) // - 1/(n^4)

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

81-n^-4 = 0

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

n^-4 = 81

-4 < 0

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

1 = 81*n^4 // : 81

1/81 = n^4

n^4 = 1/81 // ^ 1/4

abs(n) = 1/3

n = 1/3 or n = -1/3

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

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