Banner 0
Banner 1
Banner 2
Banner 3
Banner 4
Banner 5
Banner 6
Banner 7
Banner 8

Q.

The equation x10+11x-110=0  has 10 complex roots   r1,r¯1,r2,r¯2,r3,r¯3,r4,r¯4,r5,r¯5

The value of 1r1r¯1+1r2r¯2+1r3r¯3+1r4r¯4+1r5r¯5 is equal to R then R122 is equal to 

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.
An Intiative by Sri Chaitanya

answer is 5.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

JEE

NEET

NEET

Foundation JEE

Foundation JEE

Foundation NEET

Foundation NEET

CBSE

CBSE

Detailed Solution

x10+11x-110=0 

11-1x10=0

consider ω=11-1x

ω=cis 2kπ+π10,k=0,1,2_ _ _ _ __90 1x=11-ω 1xx¯=11-ω11-ω¯=121+ωω¯-11ω+ω¯ =122-11ω+ω¯ 1r1r1¯+1r2r2¯1r3r3¯-------+1r5r5¯=5.122-11 ω1+ω1¯+ω2+ω2¯+ω3+ω3¯+ω4+ω4¯+ω5+ω5¯ R=5.122 R122=5

Watch 3-min video & get full concept clarity

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon