Question

Qual o valor de (5+2i) x (2-7i) ​

Answer 1

$\sf (5 + 2i)\cdot (2 - 7i)$

$\sf 10 - 35i + 4i - 14 {i}^{2}$

$\sf 10 - 35i + 4i - 14\cdot ( - 1)$

$\sf 10 - 35i + 4i + 14$

$\sf 10 + 14 - 35i + 4i$

$\red{\sf 24 - 31i}$