Réponse :
A = (3x-2)² - (2x+3)²
A = (9x² - 12x + 4) - (4x² + 12x + 9)
A = 9x² - 4x² - 12x -12x + 4 - 9
A = 5x² - 24x - 5
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Réponse :
A = (3x-2)² - (2x+3)²
A = (9x² - 12x + 4) - (4x² + 12x + 9)
A = 9x² - 4x² - 12x -12x + 4 - 9
A = 5x² - 24x - 5