Question

Simplify the number using the imaginary unit i.
Sqrt -28

Answer 1

You can write :

\[\sqrt{-28} = \sqrt{-1 \times 28} = \sqrt{-1} \times \sqrt{28}\]

And : \(\sqrt{-1} = i\)

Plug in the above expression and tell me what did you get ??

Answer 2

\[\sqrt{-28}=7\times2\times2\]
\[\sqrt{-28}=-2\sqrt{7}\]
OR
\[\sqrt{-28}=2\sqrt{-7}\]