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Prove that a 2 + b 2 + c 2 - a b - b c - c a is always non - negative for

Prove that $a^{2} + b^{2} + c^{2} - a b - b c - c a$ is always non $-$ negative for all values of $a, b$ and c $q,$ ANSWER

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Prove that a 2 + b 2 + c 2 - a b - b c - c a is always non - negative for

Prove that a2+b2+c2-ab-bc-ca is always non-negative for all values of a,b and c q, ANSWER

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Prove that $a^{2} + b^{2} + c^{2} - a b - b c - c a$ is always non $-$ negative for all values of $a, b$ and c $q,$ ANSWER