gaokao 2020 Q1

gaokao · China · national-I-science 5 marks Complex Numbers Arithmetic Modulus Computation

If $z = 1 + \mathrm { i }$, then $\left| z ^ { 2 } - 2 z \right| =$
A. 0
B. 1
C. $\sqrt { 2 }$
D. 2

If $z = 1 + \mathrm { i }$, then $\left| z ^ { 2 } - 2 z \right| =$\\
A. 0\\
B. 1\\
C. $\sqrt { 2 }$\\
D. 2