9x² - 81 = (3x)² - 9² = (3x+9) (3x-9)
puisque a² - b² = (a+b) (a-b)
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9x² - 81 = (3x)² - 9² = (3x+9) (3x-9)
puisque a² - b² = (a+b) (a-b)