Answer:
C
Step-by-step explanation:
Imaginary Number \(i\) is defined as the square root of \(-1\)
We can write: \(i=\sqrt{-1}\)
Now, we want to simplify \(\sqrt{-28}\)
We can use the formula \(\sqrt{(a)(b)} =\sqrt{a} \sqrt{b}\) to simplify it further:
\(\sqrt{-28} \\=\sqrt{(-1)(28)} \\=\sqrt{-1} \sqrt{28}\)
Using the fact that \(i=\sqrt{-1}\) , we can write:
\(i\sqrt{28}\)
This is answer choice C.
