Réponse :
bonjour
4 x + 10 = - 8
4 x = - 8 - 10
4 x = - 18
x = - 18/4 = - 9 /2
5x - 3 = 7x + 9
5 x - 7 x = 9 + 3
- 2 x = 12
x = - 6
2(7x + 10) - (2x - 2) = 0
14 x + 20 - 2 x + 2 = 0
12 x = - 20 - 2
12 x = - 22
x = - 22/12 = - 11 /6
(5x + 6) (2x - 7) = 0
soit 5 x + 6 = 0 et x = - 6 /5
soit 2 x - 7 = 0 et x = 7/2
(2x - 5)-9 = 0
2 x - 5 - 9 = 0
2 x = 9 + 5
2 x = 14
x = 7
x² - 36 = 0
( x - 6 ) ( x + 6 ) = 0
x = 6 ou - 6
25 x + 9 - 30 x = 0
- 5 x = - 9
x = 9/5
(4x + 5) (3x + 6) + ( 4x + 5) (6x - 8) = 0
( 4 x + 5 ) ( 3 x + 6 + 6 x - 8 ) = 0
( 4 x + 5 ) ( 9 x - 2 ) = 0
x = - 5/4 ou 2/9
Explications étape par étape
