For questions 1-6, let U={0,1,4,9,16,25,36,49,64,81},  A={0,9,16,36,64}, and B={1,9,25,49,81}. Find A U B then Find B'

then find |A|​

the answer A U B is 0,1,9,16,25,36,49,64,81. and the answer A n B is 9

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:

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step-by-step explanation:

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