# How do you multiply #(-8i)^2#?

##### 1 Answer

Aug 1, 2016

#### Explanation:

Let's do this in increasingly complex bits:

There are 3 elements to what is being squared:

If we were to only have

If we were to have

But we have

We already know that the first four terms product to 64. So what to do with the

And so now we can work out