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Sagot :

[tex]F = 9 + 12x + 4x² + ( 3 + 2x) ( -x -1) \\ = 9 + 12x + 4x {}^{2} - 3x - 3 - 2x {}^{2} - 2x \\ = 2x {}^{2} - 7x + 6[/tex]

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