Question

Resolvaa)(8-4i)-(9+10i)
b)(6+3i).5i
c)(8-9i).(3+2i)
d)5+2i/3+4i
e) i4326

Answer 1

a) 72+80i-36i-40i² = 72+116i +40 = 112+116i
b) 30i+15i² = 30i - 15 = -15+30i
c) 24+16i+27i-18i² = 24+43i+18 = 42+43i
d) (5+2i).(3-4i) / (3+4i).(3-4i) = 15-20i+6i-8i² / 9 - (4i)² =
15-14i+8 / 9 - 16i² = 23 - 4i / 9+16 = 23 - 4i / 25
e) 4326i = ...............4326:4 = 1081 e sobram 2 --> = i² = -1