Question

What is the square root of -8?

Answer 1

$\pm 2i\sqrt{2}$
Explantion:
We have the following:
$\sqrt{-8}$
We can rewrite this as
$\sqrt{8}\cdot \sqrt{-1}$
Recall that $i=\sqrt{-1}$
We can further break this down as
$\sqrt{4}\cdot \sqrt{2}\cdot i$, or
$\pm 2i\sqrt{2}$