Q: How do you solve 3 to the power of what equals 81?

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3 to the power of 4 = 81

± 3 to the fourth power equals 81.

3^(-2x + 2) = 81? log(3^(-2x + 2)) = log(81) (-2x+2)log(3) = log(81) -2x = log(81)/log(3) - 2 x = (-1/2)(log(81)/log(3)) + 1

3

3/9 = x/81 x = 27 So: 3/9 = 27/81

34 = 81

Notice that 243 is 3 to the 5th power.So your equation says:3x = 35I'd say that 'x' is probably 5.

3^(-4) = (1/3)^4 = 1/81

Its 3 to the fourth power. Is that what you're asking?

3 to the fourth power=81Three to the fourth power is 81.

84

81