Réponses

  • Utilisateur Brainly
2014-09-28T19:42:07+02:00
49 - (x + 2)²
= 7² - (x + 2)²
= (7 - x - 2)(7 + x + 2)
= (- x + 5)(x + 9)

x² - 25 + 2(x - 5)(x + 3)
= (x + 5)(x - 5) + (x - 5)(2x + 6)
= (x - 5)(x + 5 + 2x + 6)
= (x - 5)(3x + 11)