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3) 3a - 2b = 3(2y + 3x² - xy) - 2(x² + 2xy - 3y)= 6y + 9x² - 3xy - 2x² - 4xy + 6y
= 9x² - 2x² - 3xy - 4xy + 6y + 6y
= 7x² - 7xy + 12y
= 12y + 7x² - 7xy (A)
4) (3 - 2x) (4x - 5) = 12x - 15 - 8x² + 10x
= -8x² + 12x + 10x - 15
= -8x² + 22x - 15 (D)