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Sagot :

Bonjour, voilà la réponse

( 2x+1)(2x+3)+1

= 2x*2x + 2x*3 + 1*2x + 1*3 + 1

= 2x² + 6x + 2x + 3 + 1

= 2x² + 8x + 4

(PS:  le signe * signifie multiplier )

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