Répondre :

droopette
a)(y+9)(y+6)+y+9
=(y+9)(y+6)+(y+9)
=(y+9)(y+6+1)
=(y+9)(y+7)

b)(2y-5)² + 2y-5
=(2y-5)(2y-5)+(2y-5)
=(2y-5)(2y-5+1)
=(2y-5)(2y-4)
=2(2y-5)(y-2)

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