Q.

Let P={z:|z+23i|1} and Q={z:z(1+i)+z¯(1i)8}. Let in PQ,|z3+2i| be maximum and minimum at z1 and z2 respectively. If |z1|2+2|z2|2=α+β2, where α,β are integers, then α+β4 equals____.

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answer is 9.

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Detailed Solution

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 Question Image
Clearly for the shaded region z1 is the intersection of the circle and the line passing through P(L1) and z2 is intersection of line L1&L2  
Circle : (x+2)2+(y3)2=1 
L1:x+y1=0, L2:xy+4=0 
On solving circle & L1 we get z1:(212,3+12)
On solving L1 and z2 is intersection of line L1&L2  
we get z2:(32,52) 
|z1|2+2|z2|2=14+52+17=31+52 
So α=31, β=5  
α+β=36 

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