bonjour
A = 2 x² + 5 x - 2 x - 5
= 2 x² + 3 x - 5
B = 20 x - 36 - 10 x² + 18 x
= - 10 x² + 38 x - 36
C = - x² + x + x - 1
= - x² + 2 x - 1
d = 18 + 9 x + 12 x + 6 x²
= 6 x² + 21 x + 18
E = 4 - 6 x² - 10 x
f = - 4 x² - 36 + 3 x² + 27 x
= - x² + 27 x - 36
G = 9 x² + 54 x + 81
H = 28 x² - 42 x - 32 x + 48 + 10
= 28 x² - 74 x + 58
