Answer:
3+9i
Step-by-step explanation:
The given expression is
(4 + 2i) - (1 - 7i)
Expand the parenthesis to obtain;
4 + 2i-1 + 7i
Group the imaginary parts and the real number parts separately to obtain;
4 -1+ 2i+ 7i
Combine the similar terms to get;
3+ 9i
