if a+b+c=9 and ab+bc+ca=26 find a^2 + b^2 + c^2
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do (a+b+c)square than ans is 29...
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(a+b+c)^2=9^2
a^2 +b^2 + c^2 +2(ab+bc+ca)= 81
a^2+b^2+c^2+ 2×26=81
a^2+ b^2 +c^2=81-52
a^2+ b^2 +c^2= 29
a^2 +b^2 + c^2 +2(ab+bc+ca)= 81
a^2+b^2+c^2+ 2×26=81
a^2+ b^2 +c^2=81-52
a^2+ b^2 +c^2= 29
abhaygoel71:
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