Carol H. answered 02/03/18
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4a2b2 - 16ab2c + 16b2c
4(4)2(6)2 - 16(4)(6)2(3) + 16(6)2(3) =
4(16)(36) - 64(36)(3) + 16(36)(3) =
2304 - 6912 + 1728 =
-2880