This is division of 2 complex numbers.
2__ =
3 - i
Multiply both numerator and denominator by conjugate number of the denominator.
2 * 3+ i =
3 - i 3 +i
separate the rational and irrational numbers from
each other
6 + 2i = 3 + 1 i
10 5 5
This is also division of 2 complex numbers into each other.
