Question 158040
Are you trying to say that the index of the radical symbol is 4 and the number in the radicand is 81?

In other words, find the fourth root of 81?

If that is the case, then ask yourself: What number times itself 4 times, will produce 81?

How about 3?

3 x 3 x 3 x 3 = 81

The root is 3.