Which choice is equivalent to the expression below ?

Hi there!

D. 9i

*The answer must have a positive sign.*

Step-by-step explanation:

Definition of Square Root

Square root- of a number is one of the number's two equal factors.

Every positive number has two square roots, one positive and one negative. The radical symbol, , indicates the non-negative or principle square root.

First, you apply radical rule

Then you apply imaginary by number rule.

Therefore, the final answer is 9i.

I hope this helps you! :)

-Charlie

Thank you!