Réponse :
bonjour
5 x - 2 x - 2 = 0
3 x = 2
x = 2/3
( 3 x - 1 ) ( - 2 x - 7 ) = 0
x = 1/3 ou - 7/2
f (x) = 2 x² - x + 1/2
f ( - 5 ) = 2 ( - 5 )² - ( -5 ) + 0.5 = 50 + 50.5 = 100.5
g (x) = - x /3 + 2 /5
- x /3 + 2/5 = 1
- 5 x /15 + 6 /15 = 15/15
- 5 x = 15 - 6
- 5 x = 9
x = - 9/5
Explications étape par étape
