Question

Помогите пожалуйста.?очень нужно

Answer 1

$z1 + z2 = (x1 + x2) + i (y1 + y2) = (5 + 8) + i(1 + ( - 1)) = 13$
$z1 - z2 = (x1 - x2) + i(y1 - y2) = (5 - 8) + i(1 - ( -1)) = - 3 + i2$
$z1 \times z2 = (x1x2 - y1y2) + i(x1y2 + x2y1) = (5 \times 8 - 1 \times ( - 1)) + i(5 \times ( - 1) + 8 \times 1) = 41 + i3$