bonjour
A = ( x + 4 ) ( x + 5 )
A = x² + 5 x + 4 x + 20
A = x² + 9 x + 20
B = ( 2 x + 3 ) ( 5 x + 2 )
B = 10 x² + 4 x + 15 x + 6
B = 10 x² + 19 x + 6
C = ( 3 x + 2 ) ( x - 4 )
C = 3 x² - 12 x + 2 x - 8
C = 3 x² - 10 x - 8
D = ( 4 x - 5 ) ( 4 x + 5 )
D = 16 x² - 25 = identité remarquable
