When you have a nth root of a term to the xth power, you can rewrite it in the form of 256^(x/n)=(nth root of 256)^x Now you can simplify the radical and then raise it to the x power.
Your n=8 and x=2 so the notation isn't confusing.
Replace 256 with 2^8. Replace the 8th root symbol with ^(1/8) so you have ((2^8)^2)(1/8).
Then use your index law that says (a^m)^n = a^mn and you will have your answer!!
DON'T TOUCH YOUR CALCULATOR!!