bonjour
A = x² + 3 x - 2 x - 6 = x² + x - 6
B = 2 x² +14 x + x + 7 = 2 x² + 15 x + 7
C = 15 x - 3 x² - 10 + 2 x = - 3 x² + 17 x - 10
D = 7 x - 2 x² + 28 - 8 x = - 2 x² - x + 28
E = x² + 16 x + 64
f = x² - 8 x + 16
G = 9 x² + 30 x +25
H = 4 x² - 28 x + 49
I = x² - 81
