bonjour
A = 4 x ( x - 1 )
B = x ( 7 x + 5 )
C = 3 ( 9 x² + 3 x + 2 )
D = ( 2 x + 1 )²
E = ( x - 7 ) ( x + 7 )
F = ( x - 5 )²
G = ( 5 - x ) ( 6 x - 3 - 2 x + 7 )
= ( 5 - x ) ( 4 x + 4 )
= 4 ( 5 - x ) ( x + 1 )
H = ( x + 8 )²
I = 4 ( 4 x² - 6 x + 2 )
J = ( 7 - 3 x ) ( 7 + 3 x )
L = ( 9 - 4 x ) ( 9 + 4 x )
K = ( 2 x + 1 ) ( 3 - 4 x + x + 7 )
= ( 2 x + 1 ) ( - 3 x + 10 )
