9 a ^ { 2 } + 4 b ^ { 2 } + 16 c ^ { 2 } + 12 a b - 16 b c - 24 c a – InterviewSolution

1.

9 a ^ { 2 } + 4 b ^ { 2 } + 16 c ^ { 2 } + 12 a b - 16 b c - 24 c a

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tq very much

actually I didn't got the sum

I am confusing at changing of symbols and taking common

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