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Knssd
@Knssd
May 2019
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BONSOIR jai besoin d'aide svp pour la question 4 de cet exercice merci bcp d'avance
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isapaul
Verified answer
Bonsoir,
B(x) = (x+2) / (x² - 9)
1)
x² - 9 = 0 pour x = -3 et x = 3
2)
x² - 9 = (x + 3)(x - 3)
3)
x -∞ -3 -2 3 +∞
(x+2) - - 0 + +
(x+3) - 0 + + +
(x-3) - - - 0 +
(x+3)(x-3) + 0 - - 0 +
B(x) - ║ + 0 - ║ +
B(x) ≤ 0 x ∈ ] -∞ ; -3 [ ∪ [ -2 ; 3 [
4) Voir pièce jointe
Bon W.E
1 votes
Thanks 0
isapaul
Pour simplifier j'utilise un traceur de courbe.
isapaul
Alors il faut faire un tableau de valeurs pour -7< x > 7
isapaul
Pardon de -7 < x < 10
isapaul
Bonjour,oui tout à fait
isapaul
Bonsoir,il suffit de le comparer à la courbe de ma pièce jointe
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Lista de comentários
Verified answer
Bonsoir,B(x) = (x+2) / (x² - 9)
1)
x² - 9 = 0 pour x = -3 et x = 3
2)
x² - 9 = (x + 3)(x - 3)
3)
x -∞ -3 -2 3 +∞
(x+2) - - 0 + +
(x+3) - 0 + + +
(x-3) - - - 0 +
(x+3)(x-3) + 0 - - 0 +
B(x) - ║ + 0 - ║ +
B(x) ≤ 0 x ∈ ] -∞ ; -3 [ ∪ [ -2 ; 3 [
4) Voir pièce jointe
Bon W.E