bonjour
A = 10 x + 6 x²
C = 21 x + 63 - 15 x² - 45 x = - 15 x² - 24 x + 63
E = ( 3 + x ) ( 15 - y ) 45 - 3 y + 15 x - xy
G = ( 2 x - 8 ) ² = 4 x² - 32 x + 64
B = ( 4 x + 3 ) ( x - 11 ) = 4 x² - 44 x + 3 x - 33 = 4 x² - 41 x - 33
D = ( 7 - 2 y ) ( 4 - 5 y ) = 28 - 35 y - 8 y + 10 y² = 10 y² - 43 y + 28
F = ( - 3 + y ) ( y - 9 ) = - 3 y + 27 + y² - 9 y = y² - 12 y + 27
H = ( 3 x - 4 )( 3 x + 4 ) = 9 x ² - 16
