Question

resolva as multiplicaçoes;
a) (3+2i).(5+4i)

b) (5-2i).(2+3i)

Answer 1

a) (3+2i).(5+4i)
15+12i+10i+8i²
15+22i+8(-1)
15+22i-8
15-8+22i
7+22i

b) (5+2i).(2+3i)
10+15i+4i+6i²
10+19i+6(-1)
10+19i-6
10-6+19i
4+19i