4x(x-1)-(2x-1)^2
4x(x-1) - (2x-1)(2x-1)
4x² - 4x - (4x² - 2x - 2x +1)
4x² - 4x - 4x² + 4x - 1
-1
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4x(x-1)-(2x-1)^2
4x(x-1) - (2x-1)(2x-1)
4x² - 4x - (4x² - 2x - 2x +1)
4x² - 4x - 4x² + 4x - 1
-1