You can tenth-root the Y^10.
For example you have 1024.
1024 = 2^10, and when you 10th root it, you get 2.
However, that is really hard to do so, as you need an insanely good number sense to do so. What is more, the Y must be a whole number. If it is not, no matter how good you are at numbers, you won't be able to find it.
Another method is to use approximation methods such as newton-rahpson method.
Suppose you know Y^10 = a, where a is some real number.
Then you can let f(x) = Y^10 - a, and work from here to find a good approximation.