Question

Simplify the number using the imaginary unit i.

Answer 1

\[\sqrt{-16}\]

Answer 2

Recall that an imaginary number is defined as
\[b*i \text{ where }i =\sqrt{-1}\]
So
\[ \sqrt{-16}=\sqrt{16}*\sqrt{-1}=\sqrt{16}*i\]
Can it be simplified further?

Answer 3

Yes!

Answer 4

It's going to be 4i!