Question

Qual o modulo do complexo resultante de ( 2-3i ). ( - 1 + 2i )

Answer 1

( 2-3i ). ( - 1 + 2i ) = 4 + 7i

$\rho=\sqrt{4^2+7^2}=\sqrt{16+49}=\sqrt{65}$

Answer 2

(2-3i) . (-1+2i)
-4 . 1= -4