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maesjon
@maesjon
June 2021
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J'ai 2 exercices dont je recherche la réponse avec le développement :
(3x-1)²-(-7x+2)²
Et le 2ème exercice :
25x²-16+3(5x+4)(x-3)
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droopette
(3x-1)²-(-7x+2)²
[3x-1-(-7x+2)][3x-1+(-7x+2)
=(3x-1+7x-2)(3x-1-7x+2)
=(10x-3)(-4x+1)
Et le 2ème exercice :
25x²-16+3(5x+4)(x-3)
=
(5x+4)(5x-4)+3(5x+4)(x-3)
=(5x+4)(5x-4+3x-9)
=(5x+4)(8x-13)
3 votes
Thanks 1
maesjon
Non, en fait le but est de factoriser...
droopette
oui je viens de transformer en factoriastion
maesjon
Merci beaucoup. Correction demain ;-)
maria3000
;)
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J'ai besoin d'aide pour ces 3 exos.Pouvez-vous m'aider ?
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[3x-1-(-7x+2)][3x-1+(-7x+2)
=(3x-1+7x-2)(3x-1-7x+2)
=(10x-3)(-4x+1)
Et le 2ème exercice :
25x²-16+3(5x+4)(x-3)
=(5x+4)(5x-4)+3(5x+4)(x-3)
=(5x+4)(5x-4+3x-9)
=(5x+4)(8x-13)