bonjour
f (x) = 3 x² + 7 x
f (2) = 3 * 2² + 7 *2 = 12 + 14 = 26
f ( - 3 ) = 3 ( - 3 )² + 7 * ( -3) = 27 - 21 = 6
f ( 0) = 0
f ( √5) = 3 ( √5)² + 7 √5 = 45 + 7 √5
f (x) = 4 x /3 + 5
f ( 6) = 24/3 + 5 = 13
tu fais pareil pour 7 et - 5
f (x) = ( 3 - 2 x ) ( 5 x - 1 ) = 0
x = 3/2 ou 1/5
