bonsoir
A1 = ( 2 x - 3 ) ( 8 x - 4 )
A 1 = 16 x² - 8 x - 24x + 12
A 1 = 16 x² - 32 x + 12
A 2 = ( x + 5 ) ( 8 x - 4 ) = 8 x² - 4 x + 40 x - 20
A 2 = 8 x² + 36 x - 20
A = 16 x² - 32 x + 12 + 8 x² + 36 x - 20 = 24 x² + 48 x - 8
A = ( 2 x - 3 ) ( x + 2 - 5 ) = ( 2 x - 3 ) ( x - 3 )
B = ( 5 x + 1 ) ( 3 x - 5 - x + 3 ) = ( 5 x + 1 ) ( 2 x - 2 )
C = ( 3 x + 2 ) ( - 5 x - 7 - x - 7 ) = ( 3 x + 2 ) ( - 6 x - 14 )
D = ( 7 x - 3 ) ( 5 x - 8 - 7 x + 3 ) = ( 7 x - 3 ) ( - 2 x - 5 )
