if a+b+c=12,ab+bc+ca=37,a a square + b square B square + c square is equals to 90
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a+b+c=12a+b+c=12
(a+b+c)2=122(a+b+c)2=122
a2+b2+c2+2(ab+bc+ca)=144a2+b2+c2+2(ab+bc+ca)=144
64+2(ab+bc+ca)=14464+2(ab+bc+ca)=144
ab+bc+ca=144−642ab+bc+ca=144−642
=40
a+b+c=12a+b+c=12
(a+b+c)2=122(a+b+c)2=122
a2+b2+c2+2(ab+bc+ca)=144a2+b2+c2+2(ab+bc+ca)=144
64+2(ab+bc+ca)=14464+2(ab+bc+ca)=144
ab+bc+ca=144−642ab+bc+ca=144−642
=40
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