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Question

If |z1|=2,|z2|=3, then the maximum value of |z1+z2+5+12i| is

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Solution

Given |z1|=2,|z2|=3
We know, |z1+z2++zn||z1+|z2|++|zn|
|z1+z2+(5+12i)||z1+|z2|+|5+12i|
|z1+z2+(5+12i)|2+3+13
|z1+z2+(5+12i)|18

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