Réponses

2014-10-08T20:56:21+02:00
Bonsoir

je te fais 2 exemples, ensuite à toi de faire

a= 3 x + 12
b= x - 4 - 2 - 4x = - 3x - 6
  • Utilisateur Brainly
2014-10-08T21:11:21+02:00
3(x + 4)
= 3x + 12

(x - 4) - (2 + 4x)
= x - 4 - 2 - 4x
= - 3x - 6

4 - (x² + 5x - 8)
= 4 - x² - 5x + 8
= - x² - 5x + 12

(x + 2)(x + 6)
= x² + 6x + 2x + 12
= x² + 8x + 12

2(x + 3) - (x + 4)
= 2x + 6 - x - 4
= x + 2

(x - 2)(x - 6)
= x² - 6x - 2x + 12
= x² - 8x + 12