Réponse :
bonsoir
7 x = 42
x = 6
- 2 x = 18
x = - 9
x + 7 = 25
x = 25 - 7
x = 18
x - 87 = 3
x = 3 + 97
x = 90
3 x /7 = 10.5
3 x = 73.5
x = 24.5
- 5 x + 7 = 9 x + 3
- 5 x - 9 x = 3 - 7
- 14 x = - 4
x = 4/14 = 2 /7
E (x) = - 18 x² + 33 x + 48 - 88
E (x) = - 18 x² +33 x - 40
G (x) = 6 x² - 24 x + 15 x - 60 - 3 ( - 6 x² + 12 x + 15 x - 30 )
G (x) = 6 x² - 9 x - 60 - 3 ( - 6 x² + 27 x - 30 )
G (x) = 6 x² - 9 x - 60 + 18 x² - 81 x + 90
G (x) = 24 x² - 90 x + 30
Explications étape par étape
