Final answer:
To express (81^1/4)^3 in simplest radical form, we can multiply the exponents by 3 and simplify the resulting exponent to 3/4.
Step-by-step explanation:
To express (81^1/4)^3 in simplest radical form, we can simplify the exponent first. To do this, we multiply the exponents by 3, since we are cubing the expression. (81^1/4)^3 becomes 81^(1/4) * 3. Next, we simplify the exponent by multiplying 1/4 by 3 which equals 3/4. Therefore, the expression becomes 81^(3/4).