Problem :
What is the sum and the difference of 3 + 2ı and -2 + 4ı?
(3 + 2ı) + (- 2 + 4ı) = 1 + 6ı.
(3 + 2ı) - (- 2 + 4ı) = 5 + (- 2)ı.
Problem :
What complex number is equal to its complex conjugate?
Any real number is equal to its complex conjugate.
a + 0ı = a - 0ı = a.