Question

When simplified, what is the value of

Answer 1

if i^2 = −1?

Answer 2

\[\sqrt{(9\times5\times i ^{2}}\]That is the same as \[\sqrt{-45}\]if we go by the information you have provided.
Now just remove the the perfect squares by putting the roots outside the radical this would resut in:
\[3i \sqrt{5}\]You may arrange that in the order you or your teacher prefers.