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Anonymous
(2x - i)(2x + i)where i is the square root of negative 1.x = 0.5i, -0.5i
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-((4x + 1)(x - 1))
(2x + 1)(2x + 1) or (2x + 1)2
4(x + 2)(x + 1)
(2x - 1)(2x + 5)
(3x - y)(3x - 5y) and (2x + 1)(2x + 11)