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= 4x² - 28x + 5x - 35
= 4x(x - 7) + 5(x - 7)
= (4x + 5)(x - 7)
6. 5x² - 18x - 8
= 5x² - 20x + 2x - 8
= 5x(x - 4) + 2(x - 4)
= (5x + 2)(x - 4)