Answered

bonjour j'ai besoin d'aide svp
Résous les équations suivantes :
2x + 3 = 4x + 5;
2x - 3 = - 4x + 5;
-2x + 3 = 4x - 5;
- 2x - 3=-4x - 5.
merci d'avance ​

Sagot :

bonjour,

2x + 3 = 4x + 5

3-5 = 4x -2x

-2 = 2x

x= -2/2 = -1

2x - 3 = - 4x + 5

2x+4x = 5 +3

6x = 8

x = 8/6 =4/3

-2x + 3 = 4x - 5

3+5 = 4x +2x

8 = 6x

x= 8/6 = 4/3

- 2x - 3=-4x - 5

-2x+4x= -5 +3

2x = -2

x= -2/2 = -1

VINS

[tex]bonjour\\\\\\2 x + 3 = 4 x + 5\\2 x - 4 x = 5 - 3 \\- 2 x = 2 \\x = - 1 \\\\2 x - 3 = - 4 x + 5 \\2 x + 4 x = 5 + 3 \\6 x = 8\\x = 8/6 = 4 /3 \\\\- 2 x + 3 = 4 x - 5 \\- 2 x - 4 x = - 5 - 3 \\- 6 x = - 8\\x = 8/6 = 4 /3 \\\\- 2 x - 3 = - 4 x - 5 \\- 2 x + 4 x = - 5 + 3\\2 x = - 2 \\x = - 1 \\\\[/tex]