Réponse :
1)
4x - 3 = 0
4x - 3 + 3 = 0 + 3
4x = 3
4x / 4 = 3 / 4
x = 3 / 4
2)
6x - 9 = 3x + 4
6x - 9 + 9 -3x= 3x - 3x + 4 +9
3x = 13
x = 13 /3
3)
7+2(3-x) = 4x - 1
7 + 6 - 2x = 4x - 1
13 - 2 x - 4x = 4x - 4x - 1
-6x = -14
x = 14/6
4)
0 = -3 -2x
3 = -2x
-3/2 = x
5)
(4x-1)(-7x+2)
28x² + 8x + 7x -2
28x² + 15x - 2
Explications étape par étape
