Question

How do you simplify `(6i)(-2i)`?

Answer 1

`12`

Explanation:

We can rearrange this multiplication problem:

`(6i)(-2i)=(6*-2)(i*i)=-12i^2`

Recall the definition of `i`, that it `i=sqrt(-1)`. Squaring both sides shows that `i^2=-1`. Thus

`-12i^2=-12(-1)=12`