When we add or subtract complex numbers, we apply the same rules as operations with algebraic expressions.
That is, we treat i as x: we add or subtract the numbers together, and the x'es (that is the i's) together.
So we have, [tex]\displaystyle{ (8-6i)-(-1-3i)=8-6i+1+3i=9-3i[/tex]
Answer: D
