Question

se m = 4 + 3i e n = 5-2i entao m.n é?

Answer 1

(4+3i) x (5-2i) =
(4 x 5)+(4 x -2i) + (3i x 5) + (3i x -2i) =
(20 - 8i) + (15i - 6i^2) =
(20 - 8i) + (15i - 6(-1) = 
(20 - 8i + 15i + 6) =
(20 +6 + 15i - 8i) =
(26 + 7i)
Resposta final:   m.n = 26+7i