bonjour
4 x - 8 = x + 3
4 x - x = 3 + 8
3 x = 11
x = 11/3
3 x² = 75
x² = 25
x = √25 ou - √25 = 5 ou - 5
8 x² - 12 x = 0
4 x ( x - 3 ) = 0
soit 4 x = 0 et x = 0
soit x - 3 = 0 et x = 3
8/3 = - 4 x
8 x = - 12
x = - 12/8 = - 3/2
2 x + 14 > 10
2 x > 10 - 14
2 x > - 4
x > - 2
S ] - ∞ : - 2 [
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La réponse à tes équations son :1) (4 fois x - 8 = x + 3; x)
= [11/3]
= 3,66
2) (3 fois x² = 75; x)
= [-5 5]
3) (2x(4x-6)=0)
= 0
4) 8/3 = -4x
= [- 2/3]
= -0,66666
5)2(x+7)>10
= x>-2
voilà
bonjour
4 x - 8 = x + 3
4 x - x = 3 + 8
3 x = 11
x = 11/3
3 x² = 75
x² = 25
x = √25 ou - √25 = 5 ou - 5
8 x² - 12 x = 0
4 x ( x - 3 ) = 0
soit 4 x = 0 et x = 0
soit x - 3 = 0 et x = 3
8/3 = - 4 x
8 x = - 12
x = - 12/8 = - 3/2
2 x + 14 > 10
2 x > 10 - 14
2 x > - 4
x > - 2
S ] - ∞ : - 2 [