Question

What is the sum of 12-5i and 3 + 4i?
•-16 + 63
•9-i
•9-9i
•15-9i

Answer 1

Answer: 2nd option: 9-i

Explanation:

We can add the numbers and the terms with i separately.

12 - 5i - 3 + 4i = (12 - 3) + (-5i + 4i)

= 9 + (-i)

*Adding a negative is essentially subtracting a positive*

= 9-i