Réponse :
bonjour
Explications étape par étape
1)
f(x)=5x
f(-3.4)=5(-3.4)
f(-3.4)=-17
f(x)=18.2
5x=18.2
x=18.2/5
x=3.64
2)
coef -2.4
g(x)=-2.4x
g(x)=-8
-8=2.4x
-8/2.4=x
x=-8/(8*0.3)
x=-1/0.3
x=-10/3
g(9)=-2.4*9
g(9)=-21.6
3)
f(x)=-3.5x
f(3)= -3.5*3
f(3)=10.5
f(x)=-14
-14 =-3.5x
-14/-3.5=x
x=4
f(4)=-14
f(-16)= -3.5*-16
f(-16)=-56
f(x)=21
21=-3.5x
x=21/-3.5
x=-6
f(-6)=21
