Add and Subtract Complex Numbers
How to add and subtract complex numbers: 2 examples and their solutions.
Example 1
Example
Solution
Add the real number parts.
5 + 8 = 13
Subtract the imaginary number parts.
+2i - 3i = -i.
So
(5 + 2i) + (8 - 3i) = 13 - i.
So 13 - i is the answer.
Example 2
Example
Solution
-(2 - 7i) = -2 + 7i
Subtract the real number parts.
3 - 2 = 1
Add the imaginary number parts.
+i + 7i = +8i.
So
3 + i - 2 + 7i = 1 + 8i.
So 1 + 8i is the answer.