Given the complex number Z = 1-I, then Z & sup2; - 2Z / Z-1 equals ()

Given the complex number Z = 1-I, then Z & sup2; - 2Z / Z-1 equals ()

If you are proficient, you can calculate as follows:
Because Z-1 = - I
Z²-2Z=(Z-1)²-1
Then the original formula = z-1-1 / (Z-1) = - I + 1 / I = - 2I
This calculation is based on proficiency. If you do more calculation, you will be able to do it