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= (4x² - 12x - 10x + 30) (x-3)
= (4x³ - 12x² - 12x² + 36x - 10x² - 30x + 30x - 90)
= 4x³ - 12x² - 12x² - 10x² + 36x - 30x + 30x - 90
= 4x³ - 24x² - 10x² + 6x + 30x - 90
= 4x³ - 34x² + 36x - 90