Question

What are the complex roots of the equation x^2-20?

Answer 1

If you meant `x^2=-20`
then then `x=+-2sqrt(5)i`

Explanation:

`sqrt(-20)=sqrt(20)i=sqrt(2^2 * 5)i=2sqrt(5)i`
and
`x^2=-20rArr x=+-sqrt(-20)`