Question

numeros complexos efetue (3+5i)(1-i)

Answer 1

Olá,

aplique a distributiva,
       _____
      |       |   |
(x+y) · (x+y)
 |_____|_|

e lembre-se, i² = -1..

$(3+5i)\cdot(1-i)= 3-3i+5i-5i^2\\ (3+5i)\cdot(1-i)=3+2i-5\cdot(-1)\\ (3+5i)\cdot(1-i)=3+2i+5\\\\ \Large\boxed{(3+5i)\cdot(1-i)=8+2i}$