since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.
the inverse (opposite operation) of "to the fourth power" is "to the fourth root".
(x^4) ^ ΒΌ = 81 ^ ΒΌ
81 = 3^4 so (3 ^ 4) ^ ΒΌ = 3 ^ 1 = 3
by hand: (3 ^ 4) ^ ΒΌ = 3 ^ (4 x ΒΌ) = 3 ^ 1 = 3 (when you take a power to a power, multiply the exponents.)
or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)
step-by-step explanation: