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Q.

If u + iv = 3ix+iy+2, then y =

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a

3uu2 + v2

b

6uu2 + v2

c

9uu2 + v2

d

12uu2 + v2

answer is B.

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Detailed Solution

u+iv=3ix+iy+2 x+iy+2=3iu+iv (2+x)+iy=3i(u-iv)(u+iv)(u-iv)  (x+2)+iy=3v+i(3u)u2+v2 y=3uu2+v2

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