bonsoir
A = ( x + 1/4) ( - 3 x /4 + 2)
A = - 3 x² /4 + 2 x - 3 x /16 + 2/4
A = - 12 x² /16 + 32 x / 16 - 3 x / 16 + 8/16
A = - 12 x² + 29 x + 8
A(x) = ( 2 x - 2) ( 2 x - 5 - x - 7)
A (x) = ( 2 x - 2) ( x - 12)
B(x) = 4 ( 3 x - 1 ) ( 3 x - 1) - 9 ( x + 1)
B(x) = ( 3 x - 1) ( 4 - 9 x - 9)
B(x) = ( 3 x - 1) ( - 9 x - 5)
fais la dernière