bonsoir
A = ( 2 x - 2 )² - ( 3 - 2 x ) ²
A = 4 x² - 8 x + 4 - ( 9 - 12 x + 4 x² )
A = 4 x² - 8 x + 4 - 9 + 12 x - 4 x²
A = 4 x - 5
A = ( 2 x - 2 + 3 - 2 x ) ( 2 x - 2 - 3 + 2 x )
A = 4 x - 5
B = ( 5 a /2 - 4 b /3 )²
B = 25 a² / 4 - 40 ab /6 + 16 b² /9