bonjour
A = ( 2 x + 5)² - ( 3 x + 2) ( 5 x - 3)
A = 4 x² + 20 x + 25 - ( 15 x² - 9 x + 10 x - 6)
A = 4 x² + 20 x + 25 - 15 x² + 9 x - 10 x + 6
A = - 11 x² + 19 x + 31
B = 4 x² + 28 x + 49
B = ( 2 x + 7)² = identité remarquable
C = 36 x² - 64
C = (6 x - 8) ( 6 x + 8) = identité
882 = 2 * 3 ² * 7 ²
945 = 3 ³ * 5*7
