Adding two complex numbers can be done by separately adding the real parts of the numbers and the imaginary parts:  

$$x + y = (a + bi) + (c + di) = \underset{real}{\underbrace{(a + c)}} + \underset{imaginary}{\underbrace{(b + d)}}i $$

@[solution]({"id": "complex_arithmetic__complex_addition_solution", "codePath": "Solution.qs"})
