bonjour
f (x ) = - 2 x + 8
f (0) = 8
f ( 4) = - 8 + 8 = 0
donc courbe G 2
f (4) = 0
- 2 x + 8 = - 1
- 2 x = - 1 - 8
- 2 x = - 9
x = 9/2 = 4.5
x - 2 - 1 0 1 2 3
f (x) 12 10 8 6 4 2
