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Sagot :

MPOWER

Réponse :

Bonjour,

A = (x + 3)² – (2x – 1)(x + 3)

= x² + 6x + 9 – (2x² + 6x – x – 3)

= x² + 6x + 9 – 2x² – 6x + x + 3

= x² – 2x² + 6x – 6x + x + 9 + 3

= -x² + x + 12

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