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Q.

 Let S=z=x+iy:2z3i4z+2i is areal number Then which of the following is NOT correct? 

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a

y(,12)(12,)

b

x=0

c

y+x2+y214

d

(x,y)=(0,12)

answer is C.

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Detailed Solution

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2z3i4z+2iis  real2x+i(2y3)4x+i(4y+2)×4xi(4y+2)4xi(4y+2)imaginary  part  =00=2x(4y+2)+4x(2y3)(4x)2+(4y+2)2       (  (4x)2+(4y+2)20,x0,y12)4x(2y3)2x(4y+2)=0

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