Answer:
3-2i; 9+6i;-10-30i
Step-by-step explanation:
A x+y = 6 + 2i + (-3-4i) = 6-3+2i-4i=3-2i
B. x-y = 6 + 2i -(-3-4i) = 6 + 3 +2i+4i = 9 + 6i
C. x* y= (6 +2i) (-3-4i) = 6*-3 +6*-4i +2i*-3 +2i*-4i= -18 -24i-6i +8= 8-18 -30i= -10-30i [note: i*i = -1]
