Find the value of a^2 + b^2 + c^2 if a + b + c = 13 and ab + BC + ca = 27
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Answer is 115,this is the solution
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Answered by
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a+b+c=12
(a+b+c)2=122
a2+b2+c2+2(ab+bc+ca)=144
64+2(ab+bc+ca)=144
ab+bc+ca=144−642
=40
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