bonjour,
A = 7 x² + 35 x + 3 x + 15
A = 7 x² + 38 x + 15
B = 15 x - 30 - 6 x² + 12 x
B = - 6 x² + 27 x - 30
C = - 15 x² + 9 x - 5 x + 3
C = - 15 x² + 4 x + 3
d = 49 x² - 28 x + 4
E = 4 x² - 32 x + 2 x - 16
E = 4 x² - 30 x - 16
F = ( 8 x - 4 ) ( - x + 3 )
f = - 8 x² + 24 x + 4 x - 12
F = - 8 x² +28 x - 12