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Kahiinooushh
@Kahiinooushh
January 2021
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Svp aidez mwa c la 8 que j'arrive pas
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clarab89
C'est la 1ère proposition
car (3x+6)² -4x²
= (3x)²+ 2*3x*6 + 6² -4x²
= 9x² +36x + 36 -4x²
= 5x² +36x +36
et que (x+6)(5x+6)
= 5x² + 6x +30x +36
= 5x² +36x +36
2 votes
Thanks 1
Kahiinooushh
Comment sa je supprime le -4x2
clarab89
ton calcul est (3x+6)² -4x² donc après développé ta parenthèse tu dois enlever -4x²
Kahiinooushh
Oui mais pk on doi fai 9x2-4x2 pour trouver 5x2
clarab89
parce que tu mets tous les x² ensemble
Kahiinooushh
Oui mais pk soustraire ??
Kahiinooushh
Ah d'accord
clarab89
c'est bon t'as compris?
Kahiinooushh
Oui merci
clarab89
de rien ^^
Kahiinooushh
;)
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Lista de comentários
car (3x+6)² -4x²
= (3x)²+ 2*3x*6 + 6² -4x²
= 9x² +36x + 36 -4x²
= 5x² +36x +36
et que (x+6)(5x+6)
= 5x² + 6x +30x +36
= 5x² +36x +36