find the value of a b + BC + CA if a + b + c = 9 and a square + b square + c square = 35
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a+b+c=9
(a+b+c) ka whole square=9square=81
a square+ b square+c square+2ab+2bc+2ac=81
35+2(AB+BC+CA)=81
2(ab+BC+CA)=81-35=46
ab +BC+CA= 23Answer
(a+b+c) ka whole square=9square=81
a square+ b square+c square+2ab+2bc+2ac=81
35+2(AB+BC+CA)=81
2(ab+BC+CA)=81-35=46
ab +BC+CA= 23Answer
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