Question

What is the simplified form of the product (-4+ 21)(3 – 9i)?

Answer 1

first factor 3 out of 3-9i giving

`3(1-3i)`

then the original mutiplication would be

`(2i-4)*3(-3i+1)`

Now factor 2 out of 2i-4 giving

`2(i-2)`

Then the original multiplication would be

`2(i-2)3(-3i+1)`