Sagot :
A=(3x+1) (-2+3)
= 3x*(-2) + 3x*3 + 1*(-2) +1 * 3
=-6x +9x-2+3
A=3x+1
voila tu as la méthode à suivre
A=(3x+1) (-2+3)
A=-6x+9x-2+3
A=3x+1
B=(4x-3) (8x-8)
B=32x²-32x-24x+24
B=32x²-56x+24
C=(-2x+4) (5x-5)
C=-10x²+10x+20x-20
C=-10x²+30x-20