Verified Answer :

sqrt(x^16) is x^8.
As you can see, x^8 x^8 = xxxxxxxx xxxxxxxx which equals x^16
I don't know why Cortesalondra28 deleted my answer to the question and sayid it was wrong..

the square root is of 16 is 4, not 8.

While your statement XXXXXXXX         XXXXXXX*X does equal x^16, that is not what the question is asking.