The Total solution for NCERT class 6-12
a + b+c = 0Squaring both sides,(a + b + c)2 = 0⇒ a2 +b2 + c2 + 2(ab + bc + ca) = 016 + 2(ab + bc + c) = 0⇒ 2(ab +bc + ca) = -16⇒ ab + bc + ca =-162 =-8∴ ab +bc + ca = -8