if a+b+c=9and ab+bc+ca=26 find a2+b2+c2
we knw tht (a+b+c)2 = a2 + b2 + c2 + 2 (ab + bc+ ac)
now 92=a2+b2+c2 +2(26)
81=a2+b2+c2 + 52
81-52=a2+b2+c2
29=a2+b2+c2
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if a+b+c=9and ab+bc+ca=26 find a2+b2+c2
we knw tht (a+b+c)2 = a2 + b2 + c2 + 2 (ab + bc+ ac)
now 92=a2+b2+c2 +2(26)
81=a2+b2+c2 + 52
81-52=a2+b2+c2
29=a2+b2+c2