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Sagot :

VINS

bonjour

D =  9 + 42 x + 49 x²

Bonjour,

D = (3 + 7x)²

D = 7x (7x + 3) + 3 (7x + 3)

D = 49x² + 21x + 3 (7x + 3)

D = 49x² + 21x + 21x + 9

D = 49x² + 42x + 9

Bon Courage ; )

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