What must be subtracted from a^2+b^2+c^2-3 a b c to get 2 a^2-b^2… - Vidyadip

Question

What must be subtracted from $a^2+b^2+c^2-3 a b c$ to get $2 a^2-b^2-3 c^2+a b c$ ?

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Answer

$-a^2+2 b^2+4 c^2-4 a b c$

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