b^(-4)=1/81

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


D( b )

b = 0

b = 0

b = 0

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

b^-4 = 1/81 // - 1/81

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

b^-4-1/81 = 0

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

b^-4 = 1/81

-4 < 0

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

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

81 = b^4

b^4 = 81 // ^ 1/4

abs(b) = 3

b = 3 or b = -3

b in { 3, -3 }

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