bonsoir
C = ( 4 x + 1)² + 8 x + 2
C = ( 4 x + 1)² + 2 ( 4 x + 1)
C = ( 4 x + 1 ) ( 4 x + 1 + 2 ) = ( 4 x + 1 ) ( 4 x + 3 )
D = 2 ( 6 x - 7 ) - ( 6 x - 7 )²
D = ( 6 x - 7) ( 2 - 6 x + 7 ) = ( 6 x - 7 ) ( - 6 x + 9 )
E = ( 5 x + 2 ) ( 2 x + 1) + ( - 2 x - 1 )
E = ( 5 x + 2 ) ( 2 x + 1 ) - 1 ( 2 x + 1 )
E = ( 2 x + 1 ) ( 5 x + 2 - 1 ) = ( 2 x + 1 ) ( 5 x + 1 )