Answer:
n = 4
Explanation:
This is a logic based question. To create a rational number from a square root means that what is under the root has to be a perfect square like 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, etc...The magic number here is 4 (found by trial and error) which results in root 64 and root 36 respectively which give 8 and 6 accordingly.