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GokuBoss7
@GokuBoss7
May 2019
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Bonjour j'ai besoin d'aide svp
1) Factoriser B:
B: ( 3x + 4 )^2 - 81
2) Calculer B pour x = -5, puis pour x = 5/3
MERCI D'AVANCE
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Sulky
Verified answer
Bonjour,
Factorisation :
B = (3x + 4)² - 81
B = (3x + 4)² - 9²
B = (3x + 4 - 9)(3x + 4 + 9)
B = (3x + 13)(3x - 5)
B pour x = - 5
B = (-5 x 3 + 4)² - 81
B = 121 - 81
B = 40
B pour x = 5/3
B = (3 x 5/3 + 4)² - 81
B = 81 - 81
B = 0
2 votes
Thanks 2
Sulky
oups petite erreur d'énoncé, c'est corrigé
GokuBoss7
merci magictom
GokuBoss7
dsl mais toutes tes reponses sont fausses
GokuBoss7
dsl j'avais pas vu que tavais corrigé
Sulky
aucun souci, bon courage pour la suite :)
GokuBoss7
merci
loulakar
Verified answer
Bonjour,
B = (3x +4)² - 81
B = (3x + 4)² - 9²
B = a² - b²
B = (a - b)(a + b)
B = (3x + 4 - 9)(3x + 4 + 9)
B = (3x - 5)(3x + 13)
x = - 5
B = (3 * -5 - 5)(3 * -5 + 13)
B = (-15 - 5)(-15 +13)
B = -20 * - 2
B = 40
x = 5/3
B = (3 * 5/3 - 5)(3 * 5/3 + 13)
B = (5 - 5)(5 + 13)
B = 0 * 18
B = 0
2 votes
Thanks 1
GokuBoss7
merci
loulakar
de rien :)
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Lista de comentários
Verified answer
Bonjour,Factorisation :
B = (3x + 4)² - 81
B = (3x + 4)² - 9²
B = (3x + 4 - 9)(3x + 4 + 9)
B = (3x + 13)(3x - 5)
B pour x = - 5
B = (-5 x 3 + 4)² - 81
B = 121 - 81
B = 40
B pour x = 5/3
B = (3 x 5/3 + 4)² - 81
B = 81 - 81
B = 0
Verified answer
Bonjour,B = (3x +4)² - 81
B = (3x + 4)² - 9²
B = a² - b²
B = (a - b)(a + b)
B = (3x + 4 - 9)(3x + 4 + 9)
B = (3x - 5)(3x + 13)
x = - 5
B = (3 * -5 - 5)(3 * -5 + 13)
B = (-15 - 5)(-15 +13)
B = -20 * - 2
B = 40
x = 5/3
B = (3 * 5/3 - 5)(3 * 5/3 + 13)
B = (5 - 5)(5 + 13)
B = 0 * 18
B = 0