Répondre :
bonjour
A = 5 x ( 2 - 3 x ) = 10 x - 15 x²
B = ( 4 x + 3 ) ( 2 x + 6 ) = 8 x + 24 x + 6 x + 18 = 38 x + 18
C = ( 4 - 3 x ) ( 5 x + 2 ) = 20 x + 8 - 15 x² - 6 x = - 15 x² + 14 x + 8
bonne journée
bonjour
A = 5 x ( 2 - 3 x ) = 10 x - 15 x²
B = ( 4 x + 3 ) ( 2 x + 6 ) = 8 x + 24 x + 6 x + 18 = 38 x + 18
C = ( 4 - 3 x ) ( 5 x + 2 ) = 20 x + 8 - 15 x² - 6 x = - 15 x² + 14 x + 8
bonne journée