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Sagot :

Bonjour,

Factoriser :

(2x - 3) (4x + 5) + 16x² + 40x + 25

= (2x - 3) (4x + 5) + (4x + 5)²

= (4x + 5) (4x + 5 + 2x - 3)

= (4x + 5) (6x + 2)

= 2 (3x + 1) (4x + 5).

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