E = 5x*x+5x*3 - 7*2 - 7*(-5x)

  = 5x² + 15x - 14 + 35x = 5x² + 50x - 14

F = 2x² + 8x - 3x - 12 - 3x = 2x² + 2x - 12

G = (3)² + 2*3*x + x² = x² + 6x + 9

H = (2x)² - 2*2x*1 + 1² - x² = x² - 4x + 1

Bonjour,

E= 5x² +15x -14 +35x

=5x² +50x -14

F= 2x² +8x -3x -12 -3x

= 2x² +2x -12

G= id remarquable

= 9 +6x +x²

H= id remarquable

4x² -4x +1 -x²

= 3x² -4x +1