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Maths75015
@Maths75015
April 2019
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Aide MATHEMATIQUES Urgent !!!!
Résoudre les équations suivantes:
a) (3x - 2)(4x + 7) = -14
b) (3x - 2)(4x + 7) = 0
c) (3x - 2)(4x + 7) = 0
d) (7x - 12)(2x + 2) - (4x + 6)(7x - 12) = 0
Merci a ceux ou celles qui m'aideront :)
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nonotata
a) (3x - 2)(4x + 7) = -14
a = 12x² +21x -8x-14 +14 =0
a = 12x² +13x = 0
x(12x+13) = 0
soit x = 0 soit 12x+13 =0
12x = -13
x = -13/12
b) (3x - 2)(4x + 7) = 0
3x-2 =0 ou 4x+7 =0
3x =2 4x = -7
x = -2/3 x = -7/4
c) (3x - 2)(4x + 7) = 0
c est la meme que la b
d) (7x - 12)(2x + 2) - (4x + 6)(7x - 12) = 0
(7x-12)(2x+2-4x-6) =0
(7x-12)(-2x-4) = 0
7x -12 =0 -2x-4 = 0
7x =12 -2x = 4
x = 12/7 x = 4/-2 = -2
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a = 12x² +21x -8x-14 +14 =0
a = 12x² +13x = 0
x(12x+13) = 0
soit x = 0 soit 12x+13 =0
12x = -13
x = -13/12
b) (3x - 2)(4x + 7) = 0
3x-2 =0 ou 4x+7 =0
3x =2 4x = -7
x = -2/3 x = -7/4
c) (3x - 2)(4x + 7) = 0
c est la meme que la b
d) (7x - 12)(2x + 2) - (4x + 6)(7x - 12) = 0
(7x-12)(2x+2-4x-6) =0
(7x-12)(-2x-4) = 0
7x -12 =0 -2x-4 = 0
7x =12 -2x = 4
x = 12/7 x = 4/-2 = -2