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IsiseGaming
@IsiseGaming
January 2021
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Bonjour , je suis en seconde c'est des math j'y arrive pas svp aidez moi
Merci du fond du coeur pour l'aide!
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loulakar
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Bonjour,
exercice 1 :
1) factoriser :
4x² - 9 = (2x)² - 3²
4x² - 9 = (2x - 3)(2x + 3)
2) résoudre:
4x² - 9 ≤ 0
(2x - 3)(2x + 3) ≤ 0
2x - 3 = 0
2x = 3
x = 3/2
2x + 3 = 0
2x = -3
x = -3/2
x............|-∞..........(-3/2).........(3/2).....+∞
2x-3.....|..........(-)......................(-).......O...(+)............
2x+3....|..........(-)..............O......(+)............(+)...........
Ineq.....|.........(+).............O.....(-).......O.....(+)..........
x € ] -∞ ; -3/2 ] U [ 3/2 ; +∞ [
1 votes
Thanks 1
IsiseGaming
merci beaucoup!
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Verified answer
Bonjour,exercice 1 :
1) factoriser :
4x² - 9 = (2x)² - 3²
4x² - 9 = (2x - 3)(2x + 3)
2) résoudre:
4x² - 9 ≤ 0
(2x - 3)(2x + 3) ≤ 0
2x - 3 = 0
2x = 3
x = 3/2
2x + 3 = 0
2x = -3
x = -3/2
x............|-∞..........(-3/2).........(3/2).....+∞
2x-3.....|..........(-)......................(-).......O...(+)............
2x+3....|..........(-)..............O......(+)............(+)...........
Ineq.....|.........(+).............O.....(-).......O.....(+)..........
x € ] -∞ ; -3/2 ] U [ 3/2 ; +∞ [