developperles expression suivantes et reduire (x+3)(x-1)= 2(x+3)-x-1= (x+3)*2+(x-1)= 2(x-3)(x+3)= 3(x+3)(x-1)-x-(3-x-1)= -(x+3)²= (x+3y)(x-4)= x²+3x(x+6)=
(x+3)(x-1)= x²-x+3x-3=x²+2x-3
2(x+3)-x-1=2x+6-x-1=x+5
(x+3)*2+(x-1)=2x+6+x-1=3x+5
2(x-3)(x+3)=(2x-6)(x+3)=2x²+6x-6x-18=2x²-18
3(x+3)(x-1)-x-(3-x-1)=(3x+9)(x-1)-x-3+x+1=3x²-3x+9x-9-x-3+x-1=3x²+9x-13
-(x+3)²= -(x²+6x+9)= -x²-6x-9
(x+3y)(x-4)=x²-4x+3xy-12y
x²+3x(x+6)= x²+3x²+18x=4x²+18x
(x+3)(x-1)
x²-x+3x-3
x²+2x-3
2(x+3)-x-1
2x+6-x-1
x+5
(x+3)*2+(x-1)
2x+6+x-1
3x+5
2(x-3)(x+3)
(2x-6)(x+3)
2x²+6x-6x-18
2x²-18
3(x+3)(x-1)-x-(3-x-1)
(3x+9)(x-1)-x-3+x+1
3x²-3x+9x-9-x-3+x-1
3x²+9x-13
-(x+3)²
-(x²+6x+9)
-x²-6x-9
(x+3y)(x-4)
x²-4x+3xy-12y
x²+3x(x+6)
x²+3x²+18x
4x²+18x
voilà..... :)