Question

4 : Efetue :

A - (3+5i) + (-2+3i) + (1+i)

B - (-3+6i) . (6-3i)

C - (2-i) . (4+i) + (3-i)

Answer 1

a) 3 + 5i -2 + 3i +1 +i =
2 + 9i

b) -18+9i+36i-18i² = -18+45i-18.(-1) = -18+4 5i+18 =
45i

c) 8+2i-4i-i²+(3-i) = 8-2i+1+(3-i) = 9-2i+3-i =
12-3i