Question

If a+b+c=9 and ab+bc+ca= 26, find a2+b2+c2

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Answer:

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

(9)2= a2 +b2 +c2 + 2 (ab+bc+ca)

81=a2+b2+c2+2(26)

81= a2+b2+c2+52

81-52 = a2+b2+c2

29= a2+b2+c2

hope it helps