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2x+1)^2 = 4x^2 + 4x + 1
(2x+3)(2x-1) = 4x^2 + 4x - 6x - 3 = 4x^2 - 2x - 3
2x+1)^2 - 4 ≠ (2x+3)(2x-1).
2x+1)^2 = 4x^2 + 4x + 1
(2x+3)(2x-1) = 4x^2 + 4x - 6x - 3 = 4x^2 - 2x - 3
2x+1)^2 - 4 ≠ (2x+3)(2x-1).