Question

How do you simplify `-sqrt(-9) • sqrt4`?

Answer 1

`=> - 6 i`

Explanation:

`-sqrt(-9) * sqrt 4`

`=> - sqrt (9 i^2) * sqrt 4`, as `i^2 = -1`

`=> -i sqrt 9 * sqrt 4`

`=> -3 i * 2 = -6i`