bonjour
f (x) = x² - 2
f ( 0) = - 2
f ( 1) = 1 - 2 = - 1
f ( - 1 )= 1 - 2 = - 1
f ( - 4 ) = 16 - 2 = 14
f ( - 2) = 4 - 2 = 2
f ( 3) = 9 - 2 = 7
aucun antécédent ne donne 8
