bonjour
f (x) = 8 x
f ( 2) = 8*2 = 16
f ( - 3 ) = - 24
f ( 0 ) = 0
f ( 5) = 40
8 x = - 16
x = - 16/8 = - 2
8 x = 0
x = 0
8 x = 28
x = 28/8 = 7/2
