Question

How do you take the square root of a negative number?

Answer 1

use the imaginary number: $\sqrt{-1}$ = i

$\sqrt{-20}$

$\sqrt{(-1)*2*2*5}$

2×i$\sqrt{5}$

2i$\sqrt{5}$

another example:

$\sqrt{-4}$

$\sqrt{(-1)*2*2}$

2 × i

2i

Answer 2

Answer:

It is not possible to take the square root of a negative number, but you can use imaginary numbers

square root of -16= 4i