Ответ:
81а^2 - (3x - 2)^2 = (9a - (3a - 2)) * (9a + (3a - 2)) = (9a - 3a + 2)(9a + 3a - 2) = (6a + 2)(12a - 2) = 2*2(3a + 1)(6a - 1) = 4(3a + 1)(6a - 1)
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Ответ:
81а^2 - (3x - 2)^2 = (9a - (3a - 2)) * (9a + (3a - 2)) = (9a - 3a + 2)(9a + 3a - 2) = (6a + 2)(12a - 2) = 2*2(3a + 1)(6a - 1) = 4(3a + 1)(6a - 1)