(1) z1=3+iz_1 = 3+iz1=3+i z2=1+2iz_2 = 1+2iz2=1+2i z1+z2=4+3iz_1 + z_2 = 4 + 3iz1+z2=4+3i (2) z1=3−iz_1 = 3-iz1=3−i z2=2+2iz_2 = 2+2iz2=2+2i z1−z2=1−3iz_1 - z_2 = 1-3iz1−z2=1−3i (3) z1=−1+iz_1 = -1+iz1=−1+i 2z=−2+2i2z = -2+2i2z=−2+2i −3z=3−3i-3z = 3-3i−3z=3−3i