factorise this question please fastly
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9a² + 3a - 8b - 64b²
= 9a² - 64b² + 3a - 8b
= (3a)² - (8b)² + 3a - 8b
= (3a - 8b)(3a + 8b) + 3a - 8b
= (3a - 8b)(3a + 8b + 1).
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