Bonjour,
A= 5x² + 25x=
5x( x + 5)
B = 4x (x+3) - 2(x+3)=
(x+3) ( 4x -2)
C =(3x-5)(x+1)+ (x+1)(7x+3)
(x+1) ( 3x-5 +7x+3)=
(x+1) ( 10x -2)
Bonus : D = (5x+2) + (5x+2) (x+4)
(5x+2) ( 1+x+4) =
(5x+2) ( x+5)
E = (2x+1)² + x(2x+1)
(2x+1)(2x+1 +x)=
(2x+1)( 3x+1)
