Factoriser chaque expression. A = 7x + 21 B = 36x² - 24x C = 4x(x + 3) + (x + 3)(3x + 11) D = (5x - 1)(9x - 4) - (7x + 4)(5x - 1) E = (3x+ 5²) - (3x +5)(-2x +13
Mathématiques
vitaDG
Question
Factoriser chaque expression.
A = 7x + 21
B = 36x² - 24x
C = 4x(x + 3) + (x + 3)(3x + 11)
D = (5x - 1)(9x - 4) - (7x + 4)(5x - 1)
E = (3x+ 5²) - (3x +5)(-2x +13)
F = (24 - 21x) - (8 - 7x)(x-17)
2 Réponse
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1. Réponse nonoduchablais
Salut :)
A = 7x + 21
A = 7 x (x) + 7 x 3
A = 7(x + 3)
B = 36x² - 24x
B = 6x x 6x - 6x x 4
B = 6x(6x - 4)
C = 4x(x + 3) + (x + 3)(3x + 11)
C = (x + 3)(4x + (3x + 11))
C = (x + 3)(7x + 11)
D = (5x - 1)(9x - 4) - (7x + 4)(5x - 1)
D = (5x - 1)[[9x - 4) - (7x - 4)]
D = (5x - 1)(9x - 4 - 7x + 4)
D = (5x - 1)2x
E = (3x+ 5)² - (3x +5)(-2x +13)
E = (3x + 5)(3x + 5) - (3x + 5)(-2x + 13)
E = (3x + 5)[(3x + 5) - (-2x + 13)]
E = (3x + 5)(3x + 5 + 2x - 13)
E = (3x + 5)(5x - 8)
F = (24 - 21x) - (8 - 7x)(x-17)
Désolée, celui-là je ne sais pas du tout :/
J'espère quand même t'avoir aidé(e)! :) -
2. Réponse winner123
Bonsoir
Je t'ajoute le dernier
(24 -21x) - ( 8 -7x)(x-17)
3(8 -7x) - (8 -7x)(x -17)
(8 -7x) ( 3 - x +17)
(8 -7x)(-x +20)