bonjour, merci de m'aider, bonne soirée ​

Bonjour,

A=4x-(2-x)(x+3)

=4x-(2x+6-x²-3x)

=4x-(-x²-x+6)

=4x+x²+x-6

=x²+5x-6

B=3(x-2)(2x+5)

=(3x-6)(2x+5)

=6x²-12x+15x-30

=6x²+3x-30

C=5x-(x+1)(6x-2)

=5x-(6x²+6x-2x-2)

=5x-(6x²+4x-2)

=5x-6x²-4x+2

= -6x²+x+2

D=x(x-1)(x+2)

=(x²-x)(x+2)

=x³-x²+2x²-2x

=x³+x²-2x