Sagot :
Bonsoir,
6x + 18 = 4
6x = 4 - 18
6x = - 14
x = - 14/6
x = - 7/3
3x - 5 = 3 (2x + 1)
3x - 5 = 6x + 3
3x - 6x = 3 + 5
- 3x = 8
x = - 8/3
(x - 2) (3x + 7) = 0
x - 2 = 0 ou 3x + 7 = 0
x = 2 3x = - 7
x = - 7/3
(x + 2) (2x + 1) + (2x + 1) (4x - 1) = 0
2x² + x + 4x + 2 + 8x² - 2x + 4x - 1 = 0
2x² + 8x² + 4x + 4x + x - 2x + 2 - 1 = 0
10x² + 7x + 1 = 0
(2x + 1) (5x + 1 ) = 0
2x + 1 = 0 ou 5x + 1 = 0
2x = - 1 5x = - 1
x = - 1/2 x = - 1/5