1+ i can be written, in polar form, as where (and, of course, ). 2+ i can be written as where . 3+ i can be written as where .

By DeMoivre's formula, their product is .

The fact that the product is 10 i tells you that and or that .

where and, again by DeMoivre's formula, that is equal to . -7+ 24i can be written as where .Similarly, how can you with the help of show that