1) a² - 18a + 81 = (a - 9)² = (a - 9)(a - 9)
2) x² - 49 = x² - 7² = (x - 7)(x + 7)
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1) a² - 18a + 81 = (a - 9)² = (a - 9)(a - 9)
2) x² - 49 = x² - 7² = (x - 7)(x + 7)