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= x² + 2 (x) (2) + 2²
= x² + 4x + 4
2. (2x+1)²
= (2x)² + 2 (2x) (1) + 1²
= 4x² + 4x +1
2. (2x+1)(2x+1) = 4x^2 + 2x + 2x +1 = 4x^2 + 4x +1