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2) (3x+2)(4x-5)=12x²-15x+8x-10=12x²-7x-10
3) (4-x)(2x-7)=8x-28-2x²+7x=-2x²+15x-28
2. (3x+2) × (4x-5) = 12x² - 15x + 8x - 10 = 12x² - 7x - 10
3. (4-x) × (2x-7) = 8x - 28 - 2x² + 7x = -2x² + 15x - 28