Question 350695
I tried to understand the written problem; I interpreted it as follows:

(~(-36))(8-~((64))^(2))

Pull all perfect square roots out from under the radical.  In this case, remove the 6i because it is a perfect square.
(6i)(8-~((64))^(2))

Raising a square root to the square power results in the expression inside the root.
(6i)(8-((64)))

Remove the parentheses around the expression 64.
(6i)(8-(64))

Multiply -1 by the 64 inside the parentheses.
(6i)(8-64)

Subtract 64 from 8 to get -56.
(6i)(-56)

Multiply 6i by -56 to get -336i.
(-336i)

Remove the parentheses around the expression -336i.
-336i

(Any oy the ~ signs mena the square root of)