Bonjour
Résoudre les équations suivantes :
a) 2x - 3=0
2x = 3
x = 3/2
b) 5 + 4x = 0
4x = - 5
x = - 5/4
c) - 1 - 5x = 0
- 5x = 1
x = 1/5
d) 6x = 0
x = 0
e) 12x + 3 = x - 8
12x - x = - 8 - 3
11x = - 11
x = - 11/11
x = - 1
f) 6 - 3x = 2x + 16
- 3x - 2x = 16 - 6
- 5x = 10
x = - 10/5
x = - 2
g) 7x - 5 = 7(2 + x)
7x - 5 = 14 + 7x
7x - 7x = 14 + 5
0x = 19 --> Impossible
h) 2x – 12 = 6(x - 2) - 4x
2x - 12 = 6x - 12 - 4x
2x - 6x + 4x = 12 + 12
0x = 0 --> Vrai pour toutes les les valeurs
i) 5(2x+8) = 715 - x) --> Manque parenthèse
j) (x + 3)(x + 2) = (x + 3)(x + 1)
x² + 2x + 3x + 6 = x² + x + 3x + 3
x² - x² + 2x + 3x - x - 3x = 3 - 6
x = - 3
k) x² – 4 = 0
x² = 4
x = √4
x = 2 ou x = - 2.