Bonjour,
a)
x
x(5x+3 +2x+7)=
x( 7x +10) =
7x² +10x
b)
100
100 ( 13x-8 -7x +4)=
100 ( 6x -4)=
600x -400
c)
(x+3)
(x+3) ( 2x-1 +8x+5) =
(x+3)(10x +4)=
10x² +4x +30x +12 = 10x² +34x +12
d)
(3x-4)
(3x-4) ( 5x -9x +1) =
(3x-4) ( -4x +1)=
-12x² +3x +16x -4=
-12x² +19x -4
