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Q.

If x3e2xdx=e2x8f(x)+c then the sum of all the complex roots of f(x)=1 is

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a

2

b

1

c

12

d

3

answer is A.

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Detailed Solution

I=x3e2xdx                                                                       x2   3x2   6x     6                                                                       e2x2 e2x4 e2x8 e2x16 I=x3e2x2-3x2e2x4+6xe2x8-6e2x16 =e2x84x3-6x2+6x-3 f(x)=4x3-6x2+6x-3 f(x)=1     4x3-6x2+6x-4=0     2x3-3x2+3x-2=0     (x-1) (2x2-x+2)=0 2x2-x+2=0 has complox roots whose sum =12

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