bonsoir
f (x) = - 2 x +3
1 ) valeur de a = - 2
2 ) f ( - 1) = - 2 + 3 = 1 ( - 1 : 1 )
3 ) - 2 x + 3 = 4
- 2 x = 4 - 3
- 2 x = 1
x = - 1/2
4 ) f (0) = 3
- 2 x + 3 = 0
- 2 x = - 3
x = 3/2
f (0) = - 1 et f (5) = 14
( 14 + 1 ) / ( 5 - 0 ) = 15/5 = 3
f (5) = 14
15 + b = 14
b = 14 - 15
b = - 1
f (x) = 3 x - 1
fais pareil pour g