x2+px+2=0 x2+x+2p=0 Let 'α' be the common root ‌a2+pa+2=0 ‌a2+a+2p=0 -  - - - ‌───────────── a(p−1)+2−2p=0 ‌∴‌‌α=2 ‌‌‌4+2p+2=0 ‌‌‌2p=−6 ‌‌‌p=−3 ∴ Sum of roots ofx2+2px+8=0(i.e.,x2−6x+8=0) is 6.
