Question 51667
If a power is less than 1, which is fraction like a/b where a,b must me whole numbers and b>a,b is equal to 1, the denominater of that fraction will be the root of the base.

If A^1/b then its equals  to A's b th root. 

Eg- 4^1/2 = 4's square root(2nd root) = +/- 2


So in U'r problem 

 12^(1/2)= (4*3)^(1/2)= 2(3)^(1/2)=+ or -2*1.732...= + or -  3.464.....