215 If a+b+c=6 and ab+bc+ca = 11, find a'^2+b^2+c^2
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Given: a + b + c = 6, ab + bc + ca = 11
(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)
6² = a² + b² + c² + 2(11)
36 = a² + b² + c² + 22
a² + b² + c² = 14
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