Sagot :

Réponse:

Bonsoir,

1) a^2 -2ab +b^2

= (x^2 - 2×x× 7 +7^2 = x^2 -14x +49

2) 2(2x+1)×(16x^2 +28x +13)

3) -6x^2 +15x+14x -35

-6x^2 +29x -35

4) (x+4)^2 + (x-4) (x+4) +2x+8

2(x+4)×(x+1)

5) (5x-2) ×(1+4(2x+1))

d où (5x-2) × (1+8x+4)

13x +2