Question 750819
A very simple example, extremely simple:


Raising to a power.
{{{3^4= 3*3*3*3=9*9=81}}}.


Taking a root:
{{{sqrt(36)=sqrt(6*6)=6}}}.
The "two" root.  Called the "square" root.


Back to the 81, you could find the fourth root of 81 and this will be 3.
{{{root(4,81)=3}}}.