A = 5x + (2x – 8) (-6x + 1) B = (3x – 7)(5x + 2) - (2x - 3x2) C = -2 (-4x + 1) + (-x+ 2)(-2x + 4) Svp aider moi !!! ​

Réponse :

A = 5x + (2x – 8) (-6x + 1)

A= 5x -12x^2 + 50x -8

A= 12x^2 +55x -8

B = (3x – 7)(5x + 2) - (2x - 3x2)

B= 21x^2 -29x -14 -2x +3x^2

B= 24x^2 -31x -14

C = -2 (-4x + 1) + (-x+ 2)(-2x + 4)

C= 8x -2 +2x^2 -8x +8

C= 2x^2 +6

Réponse:

a = 5x+(2x×(-6x)+2x×1-8×(-6x)-8×1)

= 5x+(-12xaucarre+2x+48-8)

= 5x-12xaucarre+2x+40

= 7x-12xaucarre+40

b = (15xaucarre+6x-35x-14)

=15xaucarre-29x-14

c = 8x-2+(2xaucarre-4x-4x+8)

= 8x-2+2xaucarre-8x+8

=6+2xaucarre