16a 2 + 4b 2 + 9c 2 - 16ab + 12bc - 24ca = ?

1
(4a - 2b + 3c) 2
2
(4a - 2b - 3c) 2
3
(4a + 2b - 3c) 2
4
(4a + 2b + 3c) 2

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