bonjour
A (x)= ( 2 x + 2 )² - ( x - 3 )²
A (x) = 4 x² + 8 x + 4 - ( x² - 6 x + 9 )
A (x) = 4 x² + 8 x + 4 - x² + 6 x - 9
A (x) = 3 x² + 14 x - 5
B (x) = ( x + 5 ) ( 3 x - 1 )
B (x) = 3 x² - x + 15 x - 5
B (x) = 3 x² + 14 x - 5
C (x) = 3 x² + 14 x - 5
