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Morguii
@Morguii
April 2019
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Besoin d'aide svp
Résoudre chaque équation :
a) 2 (1 - 3x) + (4x + 7) = 0
b) 2 (1 - 3x) x (4x + 7) = 0
c) 4x² - 36 = 0
Merci d'avance!!
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Francoiscool
Verified answer
A) 2 - 6x +4x +7 = 0
-2x + 9 = 0
-2x = -9
x = -9/-2
x = 9/2
b) Soit:
1-3x = 0
OU
4x + 7 = 0
-3x = -1 4x = -7
x = 1/3
x = -7/4
c) 4x² - 36 = 0
(2x)² - 6² = 0
(2x - 6) (2x + 6) = 0
Soit :
2x - 6 = 0
OU
2x + 6 = 0
2x = 6 2x = -6
x = 6/2 x = -6/2
x = 3
x = -3
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Thanks 1
Francoiscool
De rien! :)
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Verified answer
A) 2 - 6x +4x +7 = 0-2x + 9 = 0
-2x = -9
x = -9/-2
x = 9/2
b) Soit:
1-3x = 0 OU 4x + 7 = 0
-3x = -1 4x = -7
x = 1/3 x = -7/4
c) 4x² - 36 = 0
(2x)² - 6² = 0
(2x - 6) (2x + 6) = 0
Soit :
2x - 6 = 0 OU 2x + 6 = 0
2x = 6 2x = -6
x = 6/2 x = -6/2
x = 3 x = -3