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Sagot :

Bonsoir,

(6x - 1)(2x + 7)

6x * 2x + 6x * 7 - 1 * 2x - 1 * 7

12x² + 42x - 2x - 7

12x² + 40x - 7

(5x - 9 ) (-x +4)

5x * (-x) + 5x * 4 - 9 * (-x) - 9 * 4

- 5x² + 20x + 9x - 36

- 5x² + 29x - 36

Bonne soirée.

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