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Sagot :

Réponse :

Bonsoir

4) D = (2x - 1)(6x + 1) - (2x - 1)(2x - 7)

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

D = (2x - 1)(4x + 8)

7) A = (2x + 3)² + (x - 2)(2x + 3)

A = (2x + 3)(2x + 3 + x - 2)

A = (2x + 3)(3x + 1)

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