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Q.

If x+iy13=5+3i, then 3x+5y=

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a

480

b

990

c

960

d

152

answer is D.

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Detailed Solution

x+iy13=5+3i x+iy=5+3i3 x+iy=53+3i3+3523i+353i2 x+iy=125-27i+225i-135 x+iy=-10+198i x=-10,y=198 3x+5y=-30+5198=960

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