Question

How do you multiply `(i)(2i)(-7i)`?

Answer 1

`(i)(2i)(-7i)=14i`

Explanation:

While dealing with operations like multiplication and division of complex numbers, one needs to remember that `i^2=-1`.

Hence, `(i)(2i)(-7i)`

= `2i^2×(-7i)`

= `-2×(-7i)`

= `14i`