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Kaitleen
@Kaitleen
April 2019
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SVP aidez moi c est un DM pour demain j'ai été absente et je suis complètement perdue un grand merci à la personne qui m'aidera
Résoudre l'équation (3x-1)²-4=0
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Commentaires (2)
Bonsoir,
Tu utilises l'identité remarquable : a² - b² = (a + b)(a - b)
(3x - 1)² - 4 = 0
(3x - 1)² - 2² = 0
[(3x - 1) + 2][(3x - 1) - 2] = 0
(3x - 1 + 2)(3x - 1 - 2) = 0
(3x + 1)(3x - 3) = 0
3x + 1 = 0 ou 3x - 3 = 0
3x = -1 ou 3x = 3
x = -1/3 ou x = 3/3
x = -1/3 ou x = 1
S = {-1/3 ; 1}
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Tu utilises l'identité remarquable : a² - b² = (a + b)(a - b)
(3x - 1)² - 4 = 0
(3x - 1)² - 2² = 0
[(3x - 1) + 2][(3x - 1) - 2] = 0
(3x - 1 + 2)(3x - 1 - 2) = 0
(3x + 1)(3x - 3) = 0
3x + 1 = 0 ou 3x - 3 = 0
3x = -1 ou 3x = 3
x = -1/3 ou x = 3/3
x = -1/3 ou x = 1
S = {-1/3 ; 1}