Question

z=1-2i e w=-3+i calcule z.w

Answer 1

$\left \lbrace \begin{array}{}z = 1 - 2i \\ \\ w = - 3 + i \end{array} \right. \\ \\ z \times w = (1 - 2i)( - 3 + i) \\ zw = - 3 + i + 6i - 2 {i}^{2} \\ zw = - 3 + 7i - 2 \times ( - 1) \\ zw = - 3 + 7i + 2 \\ \boxed{zw = 7i - 1}$