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Sagot :

Bonjour,

(x-4)(3x -9)

double distributivité

x*3x = 3x²

x*-9 = -9x

-4 * 4x= -16x

-4 * -9 = 36

=> 3x² -9x-16x+36

= 3x² -25x +36

Réponse:

C=X x 3X + X x (-9) + (-4) x 3X + (-4) x (-9)

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