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Questions  

If z4z=2, then the maximum value of zis equal to

a
1
b
2+2
c
3+1
d
5+1

detailed solution

Correct option is D

|z|−4|z|≤||z−4|z|≤z−4z=2⇒                         |z|2−2|z|−4≤0⇒        (|z|−1)2≤5⇒|z|≤1+5.The maximum value 5+1 is attained when z=5+1.

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