Question

What is the square root of -4?

Answer 1

The answer is 2i where i is the imaginary number.

Explanation:

The imaginary number i is defined as square root of -1.

So square root of -4

= square root of (4)*(-1)

= square root of (4) * square root of (-1)

= 2i

Answer 2

2i

Explanation:

-4 has no real square root only, imaginary numbers. so do as per usual. Square root of for is 2 and and the i because it is imaginary