Explanation:
16x²-1 = (4x-1)(4x+1)
4x²-9 = (2x+3)(2x-3)
16x²-4 = 4(2x+1)(2x-1)
4x²-1 = (2x+1)(2x-1)
16x²+1 = (4x+i)(4x-i)
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