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lulu59141
@lulu59141
January 2021
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Pouvez vous m'aider je n'arrive pas a le faire avec le 5 devant les parenthèse .
Déterminer le signe de l'expressions suivante :
5x (3x − 2) (x + 5)
(chapitre: tableau de signe)
Merci
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loulakar
Verified answer
Bonjour,
Il faut décomposer :
5x = 0
x = 0
3x - 2 = 0
3x = 2
x = 2/3
x + 5 = 0
x = -5
x.........|....-inf..........(-5)..........0...........2/3.....+inf
5x......|.............(-)............(-).....O....(+)........(+)........
3x-2..|.............(-).............(-)...........(-).....O...(+)......
x+5....|.............(-).....O....(+)..........(+)..........(+).......
Eq.....|............(-).......O.....(+)..O.....(-).....O....(+).....
L’equation Est positive pour :
x € ]-5;0[ U ]2/3;+inf[
L’équation est négative pour :
x € ]-inf;-5[ U ]0;2/3[
1 votes
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Verified answer
Bonjour,Il faut décomposer :
5x = 0
x = 0
3x - 2 = 0
3x = 2
x = 2/3
x + 5 = 0
x = -5
x.........|....-inf..........(-5)..........0...........2/3.....+inf
5x......|.............(-)............(-).....O....(+)........(+)........
3x-2..|.............(-).............(-)...........(-).....O...(+)......
x+5....|.............(-).....O....(+)..........(+)..........(+).......
Eq.....|............(-).......O.....(+)..O.....(-).....O....(+).....
L’equation Est positive pour :
x € ]-5;0[ U ]2/3;+inf[
L’équation est négative pour :
x € ]-inf;-5[ U ]0;2/3[