Question

Ştie cineva cum se rezolva??

Answer 1

6)

[tex]\it z = a+bi,\ \ \ \overline{z} = a-bi \\\;\\ z - \overline{z} = a+bi-(a-bi) =a+bi-a+bi =2bi \\\;\\ i(z-\overline{z})= i\cdot2bi = 2bi^2 = 2b\cdot(-1) = -2b \in \mathbb{R} [/tex]