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= 3x.2x + 7.2x - 5.3x - 5.7
= 6x² + 14x - 15x - 35
= 6x² - x - 35
4) (x + 3)(x - 8)
= x.x + 3.x - 8.x - 3.8
= x² + 3x - 8x - 24
= x² - 5x - 24