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

Prove that a2 + b2 + c2 −ab−bc−ca is always non-negative for all

1.	Prove that a2 + b2 + c2 −ab−bc−ca is always non-negative for all values of a, b, and c.
Answer» Prove that a² + b² + c² −ab−bc−ca is always non-negative for all values of a, b, and c.