Bonjour,
5x +4= 11
5x= 11-4
5x= 7
x= 7/5
7x-8= 3 x + 2
7x-3x =2+8
4x = 10
x= 10/4
x= 5/2
3 (2x+1)= 4 x
6x+3 = 4x
6x-4x -3
2x = -3
x= -3/2
(3x + 4)(5x – 7) = 0
Soit
3x+4 = 0
3x= -4
x= -4/3
soit
5x-7 = 0
5x= 7
x= 7/5
(4x-11)² = 0
(4x-11)(4x-11) = 0
4x =11
x= 11/4
(2x + 3)² = (2x + 8)(2x - 8)
4x² +12x +9 = 4x² -64
4x² +12x -4x² = -64 -9
12x = -73
x= -73/12