1 and 1/2 divided by 4 and 2/8

1 ÷ 4 = 0.25

1 ÷ 2/8 = 4

1/2 ÷ 4 = 1/8

1/2 ÷ 2/8 = 2

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) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 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:

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1