Réponse :
bonjour
f (x) = 4 x - 9
f ( - 3 ) = - 12 - 9 = - 21 donc non
f (x) = - 3 x - 5 x = - 8 x
f ( - 3 ) = 24 donc non
f (x) = - 3 x + 4
f ( - 3 ) = 9 + 4 = 13
f (x) = - 7 x /3 - 3
f ( - 3 ) = 21/3 - 3 = 7 - 3 = 4 donc oui
f (x)= 4 donc non
f (x ) = - 3 donc non
f ( x ) = - 4 x /3
f ( - 3 ) = - 12 /3 = - 4
f (x ) = - 3 x / 4 = 9 /4
f (x) = - 11 x /6 + 19/2 = 33 /6 + 19/2 = 33/6 + 57/6 = 90/6 = 15
Explications étape par étape