Bonjour, désoler du dérangement encore une fois, mais pouvez-vous me confirmer que: ( 3x + 5 )² - ( 7- 2x ) ( 3x + 5 )
= 9x² + 25 + 30x + 21x + 35 - 6x² - 10x
= 3x² + 41x + 60

Merci beaucoup
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