how do you find the square root of 49x^5?

Answer 1

That would be 7*x^(5/2)

For a number, you would need to know the value of x.

x^(5/2) is the square root of x^5

Answer 2

where did you get the 2?

Answer 3

The square root of any number x can be written x^(1/2)

That way,
x^(1/2) * x^(1/2) = x^1 = x