bonjour
A = ( x - 4 )² + ( x + 2 )²
A = x² - 8 x + 16 + x² + 4 x + 4
A = 2 x² - 4 x + 20
B = x² + 10 x + 25 - ( 4 x² - 16 x + 16 )
b = x² + 10 x + 25 - 4 x² + 16 x - 16
B = - 3 x² + 26 x + 9
C = 48 - 3 ( 4 x² + 4 x + 1 )
C = 48 - 12 x² - 12 x - 3
C = - 12 x² - 12 x + 45
D = ( 3 x + 2 ) ( 4 x² - 4 x + 1 )
D = 12 x ³- 12 x² + 3 x + 8 x² - 8 x + 2
D = 12 x ³ - 4 x² - 5 x + 2