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2). (x+6)(x+6) = x² + 6x + 6x + 36 = x² + 12x + 36
3). (2x-4)(2x-4) = 4x² - 8x - 8x + 16 = 4x² - 16x + 16
4). (6+4x)(7+6x) = 42 + 36x + 28x + 24x² = 24x² + 64x + 42
5). (2x-4)(4x-7) = 8x² - 14x - 16x + 28 = 8x² - 30x + 28