acune des expressions suivantes : F=3(2 x - 4) + 5 (3 - x) G = 2 x ( 5 + 3 x ) - 4 ( x + 5) H= ( 4 x + 5) (3 x + 2) I= (5 x - 2) ( x + 7) J = ( x-5)(3 x + 5) +

Explications étape par étape:

F=3(2 x - 4) + 5 (3 - x)

=6x-12+15-5x

=6x-5x+15-12

F=x+3

G = 2 x ( 5 + 3 x ) - 4 ( x + 5)

=10x+6x²-4x-20

=6x²+10x-4x-20

G=6x²+6x-20

H= ( 4 x + 5) (3 x + 2)

=12x²+8x+15x+10

H=12x²+23x+10

I= (5 x - 2) ( x + 7)

=5x²+35x-2x-14

I=5x²+33x-14

J = ( x-5)(3 x + 5) + ( 4 x-2)(5 x - 2)

=(3x²+5x-15x-25)+(20x²-8x-10x+4)

=3x²+5x-15x-25+20x²-8x-10x+4

=20x²+3x²+5x-15x-8x-10x-25+4

=23x²+5x-33x-25+4

J =23x²-28x-21