Question
Sun September 15, 2013 By: Rudra Yadav

if a+b+c=9 and ab+bc+ca=23 then a square + b square + c squarE =

Expert Reply
Sun September 15, 2013

(a+b+c)2= a2+b2+c2+ 2ab+ 2bc+ 2ca

92= a2+b2+c2+ 2(ab+bc+ca)

81= a2+b2+c2+ 2(23)

81 = a2+b2+c2+ 46

a2+b2+c2= 35

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