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x² - 2x - 8
x² - 5x + 4
x - 4 x² - 5x + 4 = (x - 4)(x - 1)
x - 1
x² - 2x - 8
x - 4 x² - 2x - 8 = (x - 4)(x + 2)
x 2
x² - 5x + 4 (x - 4)(x - 1) x - 1
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x² - 2x - 8 (x - 4)(x + 2) x + 2