bjr
9x² - 64 = (3x)² - 8² = (3x + 8) (3x - 8)
puisque a² - b² = (a+b) (a-b)
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bjr
9x² - 64 = (3x)² - 8² = (3x + 8) (3x - 8)
puisque a² - b² = (a+b) (a-b)