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Q.

If Z = x + iy then the centre of the circle Z - 3Z - 2i = 2 is

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a

-1, -83

b

1, -83

c

-1, 83

d

1, 83

answer is C.

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Detailed Solution

z-3=2 z-2i sub  z=x+iy (x-3)+iy=2x+i(y-2) (x-3)2+y2=2x2+(y-2)2 x2+y2-6x+9=4(x2+y2-4y+4) 3x2+3y2+6x-16y+7=0 x2+y2+2x-163y+73=0 centre=-1, 83

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If Z = x + iy then the centre of the circle Z - 3Z - 2i = 2 is