4x² + 12x + 9
2²x² + 2 * 2x * 3 + 3²
(2x)² + 2 * 2x * 3 + 3²
(2x + 3)²
4x² - 12 + 9
4x² - 3
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4x² + 12x + 9
2²x² + 2 * 2x * 3 + 3²
(2x)² + 2 * 2x * 3 + 3²
(2x + 3)²
4x² - 12 + 9
4x² - 3