Bonjour
a. x + 5 = 12
x= 12-5 = 7
b. 3x = 18
x=28/3 = 6
c. 2x + 7 = 23
2x =23-7
2x= 16
x= 16/2 = 8
d. 6x + 4 = 3x – 2
6x-3x = -2-4
3x= -6
x= -6/3 = -2
a. (x – 5) (x + 7) = 0
2 solutions:
x-5 = 0
x= 5
ou
x+7 = 0
x= -7
b. (2x – 8) (3x + 9) = 0
2 solutions:
2x-8 = 0
2x= 8
x= 8/2 = 4
ou
3x+9 = 0
3x= -9
x= -9/3 = -3