Splitting the middle term 4x^2-1
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4x^2-1
4x^2 +2x -2x - 1
2x (2x+1) -1(2x+1)
(2x-1)(2x+1)
4x^2 +2x -2x - 1
2x (2x+1) -1(2x+1)
(2x-1)(2x+1)
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