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B. 6a² - 6ab - 6ba - 6b²
C. 12a² + 18ab + 18ba + 27b²
D. 90x² - 66xy -54yx -40y²
E. 4a² + 6ab + 2ac + 6ba + 9b² + 3bc + 2ca + 3cb + c²
F. 9a² - 6ab + 75ac - 6ab - 4b² - 30bc + 75ca - 30cb + 30c²