ⁿ√A
take the nth root of A

A
n

e.g. the sqaure root: If n = 2, A = 25, the nth root of A = 5. (5 × 5 = 25)
e.g. the cube root: If n = 3, A = 27, the nth root of A = 3. (3 × 3 × 3 = 27)

Do not trust the accuracy of the decimal to the last digit.


1st version, on 7 August 2010