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2). 7x² + 2x - 13 + (-9x² -2x +24) = -2x² + 14
3). (2x - 4)(3x+5) = 6x² - 7x +10x -20 = 6x² +3x -20
4). -6x² + 17x - 5 = (3x -1)(5-2x)
5). (3x-2)² = 9x² -6x -6x +4 = 9x² - 12x +4
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