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Q.

If  f(x)=x48x3+4x2+39 and f(3+2i)=a+ib then (a,b)=

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a

(24,192)

b

(24,192)

c

(24,192)

d

(24,192)

answer is C.

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Detailed Solution

Given x=3+2i(x3)2=(+2i)2

x26x+13=0

On dividing f(x) by x26x+13, quotient is x22x21and remainder is 96x+312

f(x)=(x26x+13)(x22x12)96x+312

 f(3+2i)=(0)[x22x21]96(3+2i)+312

a+ib=24192i

a=24

b=192

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