bonsoir
A = x² - 8 x + 16 - x + 6 x - 2
A = x² - 3 x + 14
B = 4 x² + 12 x + 9 - ( 16 x² - 25 )
B = 4 x² + 12 x + 9 - 16 x² + 25
B = - 12 x² + 12 x + 34
c = 9 x² - 6 x + 1 - 2 ( x² + 6 x + 9 )
C = 9 x² - 6 x + 1 - 2 x² - 12 x - 18
C = 7 x² - 18 x - 17
