Given z1=3+2iz_1 = 3 + 2iz1=3+2i and z2=1−iz_2 = 1 - iz2=1−i, evaluate z1zˉ2z_1 \bar{z}_2z1zˉ2.
5 - i
1 - 5i
5 + 5i
1 + 5i