Réponses

  • Utilisateur Brainly
2014-10-01T18:02:47+02:00
25x² - 81 - 7(5x + 9)
= (5x - 9)(5x + 9) - 7(5x + 9)
= (5x + 9)(5x - 9 - 7)
= (5x + 9)(5x - 16)