If 3−2 is a root of x4−8x3+21x2−26x+14=0 then the roots are
see full answer
Your Exam Success, Personally Taken Care Of
1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.
An Intiative by Sri Chaitanya
a
1±2, 1±i
b
−1±2, −1±i
c
3±2, 1±i
d
−3±2, −1±i
answer is C.
(Unlock A.I Detailed Solution for FREE)
Best Courses for You
JEE
NEET
Foundation JEE
Foundation NEET
CBSE
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