Question

How do you simplify `(2i)(-3+5i)`?

Answer 1

The answer is `-10-6i`

Explanation:

I like to think of treating the `i` just like it was a variable. Multiply the `2i` term through the bracket in the same way you would if it was `x`

`-6i+10i^2`

`i^2` equals -1, so the equation becomes

`-6i-10` which would usually be written

`-10-6i`