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Sagot :

A = (2x-3)²-(4x+7)(2x-3)
A = 4x² - 12x + 9 - 8x² + 12x - 14x + 21
A = 4x² - 8x² + 12x - 14x - 12x + 9 + 21
A = -4x² - 14x + 30

En espérant t'avoir aidé.

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