3a² - 9ab = 3a*(a - 3b)
4x - 18xy + 12x² - 6y = 2*(2x - 9xy + 6x² - 3y) = 2*(6x² - 9xy + 2x - 3y) =
= 2*(3x(2x - 3y) + (2x - 3y)) = 2*((2x - 3y)(3x + 1))
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3a² - 9ab = 3a*(a - 3b)
4x - 18xy + 12x² - 6y = 2*(2x - 9xy + 6x² - 3y) = 2*(6x² - 9xy + 2x - 3y) =
= 2*(3x(2x - 3y) + (2x - 3y)) = 2*((2x - 3y)(3x + 1))