Q.
If x =-9 is a root of x 3 72 x 27 6 x=0 then the other two roots are
see full answer
Start JEE / NEET / Foundation preparation at rupees 99/day !!
21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya
a
3, 7
b
2, 7
c
3, 6
d
2, 6
answer is B.
(Unlock A.I Detailed Solution for FREE)
Ready to Test Your Skills?
Check your Performance Today with our Free Mock Test used by Toppers!
Take Free Test
Detailed Solution
Applying , R1→R1+R2+R3 we get Δ=x+9x+9x+92x27¯6xTaking x + 9 common from R1 and applying C2 → C2 – C1, C3 → C3 – C1 we getΔ=(x+9)1002x−207−1x−7= (x + 9) (x – 2) (x – 7)Thus , ∆ = 0⇒ x =– 9, 2, 7∴ the other two roots are 2 and 7.
Watch 3-min video & get full concept clarity