The Total solution for NCERT class 6-12
a + b+c = 0Squaring both sides,(a + b + c)2┬а= 0тЗТ a2┬а+b2┬а+ c2┬а+ 2(ab + bc + ca) = 016 + 2(ab + bc + c)┬а=┬а0тЗТ 2(ab +bc + ca) = -16тЗТ┬аab + bc + ca =-162┬а=-8тИ┤ ab +bc + ca = -8