Réponse :
bonjour
f (x) = 2 x - 7
f ( - 4) = - 4*2 - 7 = - 8 - 7 = - 15
f ( - 3) = - 3*2 - 7 = - 6 - 7 = - 13
f (3) = 3*2 - 7 = 6 - 7 = - 1
2 x - 7 = - 9
2 x = - 9 + 7
2 x = - 2
x = - 1
donc f ( -1 ) = - 9
2 x - 7 = 1
2 x = 1 + 7
2 x = 8
x = 4
donc f ( 4) = 1
Explications étape par étape :
