Question

Se U=4+3i e V= 5-2i, então UxV é:

20-6i

26-13i

14+7i

14-7i

26+7i

Answer 1

$(4 + 3i) \times (5 - 2i) \\ = 20 - 8i + 15i - 6 {i}^{2} \\ = 20 + 7i - 6 { (\sqrt{ - 1}) }^{2} \\ = 20 + 7i - 6( - 1) \\ = 20 + 7i + 6 \\ = 26 + 7i$