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leabonneville1
@leabonneville1
January 2021
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Pouvez-vous m'aider svp c'est urgent
Merci d'avance!
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maudmarine
Verified answer
Bonjour,
1)
4x + 7 = 2x - 5
4x - 2x = - 5 - 7
2x = - 12
x = - 12/2
x = - 6
2)
9x² - 25 = 0
(3x- 5) (3x + 5) = 0
3x - 5 = 0 ou 3x + 5 = 0
3x = 5 ou 3x = - 5
x = 5/3
ou
x = - 5/3
3)
4x² + 16 = 0
(2x + 4) (2x - 4) = 0
2x + 4 = 0 ou 2x - 4 = 0
2x = - 4 ou 2x = 4
x = - 4/2 ou x = 4/2
x = - 2
ou
x = 2
4) (4x + 2) (2x - 3) - (4x + 2) (- 5x + 1)
(4x + 2) (2x - 3 - (- 5x + 1))
(4x + 2) (2x - 3 + 5x - 1)
(4x + 2) (7x - 4)
4x + 2 = 0 ou 7x - 4 = 0
4x = - 2 ou 7x = 4
x = - 2/4 ou
x = 4/7
x = - 1/2
5) (3x - 5)² - (2x + 7)² = 0
[(3x - 5) - (2x + 7)] [(3x - 5) + (2x - 7)] = 0
(3x - 5 - 2x - 7) (3x - 5 + 2x + 7) = 0
(x - 12) (5x + 2) = 0
x - 12 = 0 ou 5x + 2 = 0
x = 12
ou 5x = - 2
x = - 2/5
0 votes
Thanks 1
leabonneville1
merci beaucoup
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Svp est ce vous pouvez me donner votre avis sur la peine de mort(c'est pour un DM) merci d'avance!
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Pouvez-vous m'aider svp c'est urgent Merci d'avance
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Verified answer
Bonjour,1)
4x + 7 = 2x - 5
4x - 2x = - 5 - 7
2x = - 12
x = - 12/2
x = - 6
2)
9x² - 25 = 0
(3x- 5) (3x + 5) = 0
3x - 5 = 0 ou 3x + 5 = 0
3x = 5 ou 3x = - 5
x = 5/3 ou x = - 5/3
3)
4x² + 16 = 0
(2x + 4) (2x - 4) = 0
2x + 4 = 0 ou 2x - 4 = 0
2x = - 4 ou 2x = 4
x = - 4/2 ou x = 4/2
x = - 2 ou x = 2
4) (4x + 2) (2x - 3) - (4x + 2) (- 5x + 1)
(4x + 2) (2x - 3 - (- 5x + 1))
(4x + 2) (2x - 3 + 5x - 1)
(4x + 2) (7x - 4)
4x + 2 = 0 ou 7x - 4 = 0
4x = - 2 ou 7x = 4
x = - 2/4 ou x = 4/7
x = - 1/2
5) (3x - 5)² - (2x + 7)² = 0
[(3x - 5) - (2x + 7)] [(3x - 5) + (2x - 7)] = 0
(3x - 5 - 2x - 7) (3x - 5 + 2x + 7) = 0
(x - 12) (5x + 2) = 0
x - 12 = 0 ou 5x + 2 = 0
x = 12 ou 5x = - 2
x = - 2/5