(ii) z1−z2z_1-z_2z1−z2 z1−z2=−92+52−92+532i\boxed{z_1-z_2=-\frac{9\sqrt{2}+5}{2}-\frac{9\sqrt{2}+5\sqrt{3}}{2}i}z1−z2=−292+5−292+53i