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(2x+7)(2x+7)
(2x)(2x) + (2x)(7) + (7)(2x) + (7)(7)
4x² + 14x + 14x + 49
4x² + 28x + 49
(2x+7)(2x+7)
⇔ 4x²+14x+14x+49
⇔ 4x²+28x+49