bonjour
A=54x+72
A = 18 ( 3 x + 4 )
B=5x-10x^2
B = 5 x ( 1 + 2 x )
C=49x^2-4
C = ( 7 x - 2 ) ( 7 x + 2 )
D=(8x+3)^2-16
D = ( 8 x + 3 - 4 ) ( 8 x + 3 + 4 )
D = ( 8 x - 1 ) ( 8 x + 7 )
E=(2x-5)(5x+4)-(2x-5)(2x+5)
E = ( 2 x - 5 ) ( 5 x + 4 - 2 x - 5 )
E = ( 2 x - 5 ) ( 3 x - 1 )
F=(3x-2)^2-(x+5)^2
F = ( 3 x - 2 + x + 5 ) ( 3 x - 2 - x - 5 )
F = ( 4 x + 3 ) ( 2 x - 7 )
