(ii) z1−z2z_1-z_2z1−z2 z1−z2=9(6+2)2−9(6−2)2i\boxed{z_1-z_2=\frac{9(\sqrt{6}+\sqrt{2})}{2}-\frac{9(\sqrt{6}-\sqrt{2})}{2}i}z1−z2=29(6+2)−29(6−2)i