Réponse :
bonsoir
f (x) = - 0.8 x
f ( 3 ) = 3 * - 0.8 = - 2.4
- 0.8 x = 4
x = - 5
g (x) = 4.5
g ( - 5 ) = - 22.5
g ( 20 ) = 90
4.5 x = 4
x = env 0.89
4.5 x = 0
x = 0
f (x) = 2.5 x
f ( 0 ) = 0
f ( 1 ) = 2.5
g (x) = - 2 x /3
g ( 0 ) = 0
g ( - 3) = 6 /3 = 2
tu peux donc tracer
Explications étape par étape :
