9**(1/2)=3.0

Question

how this answer made?

Answer 1

This is a simple calculus example
'**' stands for exponentiation. So 9**(1/2) is 9 powered by 1/2.
Powering by 1/2 = taking the square root of a number
So
9**(1/2) == sqrt(9)
sqrt(9) == 3.0