bonjour
f (x) = jx + m ce qui donne pour toi f ( x) = 12 x + 12
f (2) = 24 + 12 = 36
f ( 3) = 36 + 12 = 48
f ( 0) = 12
12 x + 12 = - 5
12 x = - 5 - 12
12 x = - 17
x = - 17/12
12 x + 12 = 0
12 x = - 12
x = - 1
12 x + 12 = 28
12 x = 28 - 12
12 x = 16
x = 16/12 = 4/3