bonjour
A = x² - 16
A = ( x - 4) (x + 4)
B = 9 x² + 24 x + 16
B = ( 3 x + 4)²
C = x² + 20 x + 100
C = ( x + 10)²
D = ( x + 1)² - 4
D = ( x + 1 - 2) ( x + 1 + 2)
D = ( x - 1) ( x + 3)
E = ( x - 2)² - 9
E = ( x - 2 - 3) ( x - 2 + 3)
E = ( x - 5) ( x + 1)
F = ( 3 x - 1)² - 1
F = ( 3 x - 1 - 1) ( 3 x - 1 +1)
F = 3 x ( 3 x - 2)