Question

What is the the product of (-1 - 3i) and it’s conjugate?

Answer 1

10

Explanation:

(-1 - 3i)(-1 + 3i) = 1 - 3i + 3i -9i²

1 - 9i²; i² = -1, therefore 1 - 9(-1) = 1 + 9 = 10