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Q.

If 3−2  is a root of x4−8x3+21x2−26x+14=0 then the roots are

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a

1±2, 1±i

b

−1±2, −1±i

c

3±2, 1±i

d

−3±2, −1±i

answer is C.

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Detailed Solution

since 3-2 is root of the given equation ⇒3+2 is also root of it.x-3-2x-3+2 is a factor of it. i.e x2-6x+7 is factoe of it. Now devide the given equation with x2-6x+7 ∴x4−8x3+21x2−26x+14=x2-6x+7x2-2x+2=0 ⇒x=3±2,1±i
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