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Silent
@Silent
June 2021
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[DÉVELOPPER ET RÉDUIRE] Bonsoir, j'ai besoins d'aide pour mon exercice. C'est pour DEMAIN.
Je vous remercie d'avance.
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misout1
11) A=(-4x -5)(4x-7)
=16x² +28x -20x +35
=16x² +8x +35
B=(8-8x)(-2x-7)
= -16x -56 +16x² +56x
= 40x -56 +16x²
C= 3(4x-7)(7x+5)
= 12x -21 +21x +15
= 33x -6
D= 2x(-x-7)(10x+5)
= -2x² -14x +20x² +10x
= -18x² -4x
12) B= (3x-7)(3x+7)
= 9x² +21x -21x -49
= 9x² -49
2 votes
Thanks 2
Silent
Il n'y a pas de problème pour le A et le C du 12
Silent
je le ferais moi-même. Merci à vous.
misout1
de rien
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=16x² +28x -20x +35
=16x² +8x +35
B=(8-8x)(-2x-7)
= -16x -56 +16x² +56x
= 40x -56 +16x²
C= 3(4x-7)(7x+5)
= 12x -21 +21x +15
= 33x -6
D= 2x(-x-7)(10x+5)
= -2x² -14x +20x² +10x
= -18x² -4x
12) B= (3x-7)(3x+7)
= 9x² +21x -21x -49
= 9x² -49