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2. 16x - 1 = (4x²+1)(4x²-1)
3. (2a+b)² - (a-3b)² = (2a+b)(2a+b) - (a-3b)(a-3b)
= 4a²+4ab+b² - (a²-6ab+9b²)
= 3a² + 10ab - 8b²
= (3a - 2b) (a + 4b)
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