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Q.

If x=3+i then the value of x3-3x2-8x+15

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a

-15

b

14

c

15

d

12

answer is A.

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Detailed Solution

Given x=3+i x-3=i squaring on both sides  x-32=-1 x2-6x+9=-1 x2-6x+10=0x3-3x2-8x-15=xx2-3x-8+15 =x6x-10-3x-8+15 =x3x-18+15 =3x2-18x+15 =36x-10-18x+15 =-30+15 =-15
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