Answer:
The 1/4th power means the 4th root of a number.
Therefore for the first question, the answer should be 4th root of 1296 -4th root of 625. or \sqrt[4]{1296}
4
1296
-\sqrt[4]{625}
4
625
:D
For the second question just calculate? what to the 4th power is 1296 and what to the 4th power is 625?
They should respectively be 6 and 5. So the final answers we get is 6-5=1
If you have any questions about this just ask me in the comment and I will get to it as soon as I could.
hopecthis helps